Glossary

Geochemical Carbon Sequestration

**Geochemical Carbon Sequestration** is an innovative process aimed at mitigating the effects of climate change by capturing and storing atmospheric carbon dioxide (CO₂) in geological formations. This method leverages natural chemical reactions between CO₂ and minerals, such as silicates and carbonates, to form stable, solid carbonates. By converting gaseous CO₂ into solid minerals, this approach ensures long-term storage and minimizes the risk of carbon release back into the atmosphere. Key...

Geospatial Analysis in Climate Science

**Geospatial Analysis in Climate Science** is an essential method for understanding and mitigating the impacts of climate change. This analytical approach leverages geographical information systems (GIS) and remote sensing technologies to gather, visualize, and interpret spatial data related to the Earth's climate. By integrating various datasets—such as temperature records, precipitation levels, land-use patterns, and vegetation indices—geospatial analysis provides a multidimensional view of...

Geothermal Energy

**Geothermal Energy** is a renewable energy source that harnesses the Earth's internal heat to generate electricity and provide heating solutions. Originating from the natural radioactive decay of minerals and from solar energy absorbed at the surface, this thermal energy is stored beneath the Earth's crust. By tapping into hot water reservoirs or steam found deep within the earth, geothermal plants can convert this heat into power, resulting in a sustainable and steady supply of energy. The...

Geothermal Gradient

**Geothermal Gradient** refers to the rate at which the Earth's temperature increases with depth beneath the surface. This gradient is a crucial factor in the study of geothermal energy, as it indicates the natural heat flow originating from the Earth's core. Measured in degrees Celsius per kilometer (°C/km) or degrees Fahrenheit per mile (°F/mi), the geothermal gradient varies significantly depending on the geographical and geological settings. The Earth's crust typically exhibits a...

Global Carbon Budget

**Global Carbon Budget** refers to the finite limit of carbon dioxide (CO₂) emissions that humanity can release into the atmosphere while still having a reasonable chance of keeping global temperature rise within the internationally accepted targets, such as the 1.5°C or 2°C limits set by the Paris Agreement. This concept is crucial for guiding policy and action towards mitigating climate change and ensuring a sustainable future. The budget is calculated by considering the total emissions...

Global Climate Models (GCMs)

**Global Climate Models (GCMs)** are sophisticated computer-based tools designed to simulate the Earth's climate system. These models integrate various components of the climate, such as the atmosphere, oceans, land surface, and ice, to predict how different factors influence the climate over time. By incorporating mathematical equations based on physical laws, GCMs provide an in-depth understanding of atmospheric processes, ocean circulation, and the interaction between different climate...

Global Warming

**Global Warming** refers to the long-term increase in Earth's average surface temperature due to human activities, primarily the emission of greenhouse gases such as carbon dioxide (CO2), methane (CH4), and nitrous oxide (N2O). These gases trap heat in the atmosphere, creating a "greenhouse effect" that leads to higher temperatures across the planet. This phenomenon is largely driven by the burning of fossil fuels for energy production, deforestation, and various industrial processes. The...

Global Warming Potential (GWP)

**Global Warming Potential (GWP)** is a metric used to compare the ability of different greenhouse gases to trap heat in the Earth's atmosphere over a specific period, usually 20, 100, or 500 years. By standardizing the comparison, GWP provides a comprehensive measure of how much a particular gas contributes to global warming relative to carbon dioxide (CO₂), which is assigned a GWP value of 1. In essence, GWP helps to quantify the impact of different gases, making it easier to prioritize and...

Government Approved Test Centre (GATC)

**Government Approved Test Centre (GATC)** is an authorized testing facility approved by the government to verify and re-verify specific weights and measuring instruments under legal metrology rules. In the context of fuel dispensers, a GATC checks whether equipment such as petrol, diesel, CNG, LPG, LNG or hydrogen dispensers measures fuel accurately and complies with official standards. These centres help protect consumers, support fair trade and reduce pressure on government inspection...

Graphene

**Graphene** is a two dimensional material composed of a single layer of carbon atoms arranged in a hexagonal lattice. It is the thinnest known material and combines exceptional properties, including very high electrical and thermal conductivity, mechanical strength, flexibility and large surface area. These characteristics make graphene valuable for advanced applications in electronics, energy storage, sensors, composites and nanotechnology. Its ability to transport charge efficiently and...

Green Bonds

**Green Bonds** are financial instruments specifically designed to raise funds for projects that have positive environmental and climate benefits. These bonds are a form of debt securities issued by governments, corporations, and institutions to finance projects aimed at sustainability, such as renewable energy plants, energy efficiency enhancements, sustainable waste management, and biodiversity conservation. By directing capital towards green projects, Green Bonds play a pivotal role in...

Green Budgeting

**Green Budgeting** is the practice of integrating climate, environmental, and sustainability objectives into government budgeting and fiscal decision-making processes. It helps policymakers assess how public revenues, expenditures, tax measures, and investment plans contribute to environmental goals such as emissions reduction, resource efficiency, and biodiversity protection. Green budgeting improves transparency and supports the alignment of public finances with long-term sustainability...

Green Building

**Green Building**, also known as sustainable or eco-friendly building, involves designing, constructing, and operating buildings in ways that reduce or eliminate negative impacts on the environment and human health. This includes using energy-efficient systems, sustainable materials, and water conservation practices. Green buildings aim to reduce waste, pollution, and environmental degradation while promoting occupant health and well-being. The principles of green building can be applied to...

Green Certification

**Green Certification** is a formal recognition given to businesses, buildings, products, or services that meet specific, rigorous environmental standards. These certifications are awarded by independent, third-party organizations and serve to verify that the certified entity adheres to high-performing environmental and sustainability benchmarks. The goal of Green Certification is to encourage sustainable practices, reduce environmental impact, and promote resource efficiency. By achieving...

Green Climate Fund (GCF)

The **Green Climate Fund (GCF)** is a global initiative established to support developing countries in their efforts to combat climate change. Launched in 2010 by the United Nations Framework Convention on Climate Change (UNFCCC), the GCF aims to channel financial resources to projects and programs that reduce greenhouse gas emissions and enhance climate resilience. By fostering sustainable development, the GCF plays a pivotal role in achieving international climate goals set out in the Paris...

Green Economy

A **Green Economy** is an economic system aimed at fostering sustainable development without degrading the environment. It focuses on the intersection of economic growth, environmental sustainability, and social equity. In a Green Economy, policies and practices strive to reduce carbon emissions, enhance energy and resource efficiency, and prevent the loss of biodiversity. These initiatives not only mitigate environmental challenges but also create job opportunities, spur economic growth, and...

Green Economy Indicators

**Green Economy Indicators** are metrics and data points that help measure the environmental, social, and economic performance of an economy moving towards sustainability. These indicators encompass a variety of elements such as renewable energy usage, carbon emissions, sustainable agriculture, green jobs, waste management, and more. By focusing on these areas, they provide a comprehensive view of how well a country, region, or organization is advancing toward a greener and more inclusive...

Green Energy Tariff

**Green Energy Tariff** is a specialized plan offered by energy providers that ensures the electricity you use is sourced from renewable energy sources such as wind, solar, hydro, and biomass. This tariff is designed to support the generation of green energy, helping reduce your carbon footprint and combat climate change. By opting for a Green Energy Tariff, you commit to using cleaner energy, thus fostering a more sustainable planet. Energy providers achieve this by either directly...

Green Finance

**Green finance** refers to financial investments that support environmentally sustainable projects and initiatives. This includes funding for renewable energy, energy efficiency, pollution prevention, sustainable agriculture, and conservation efforts. Green finance aims to mobilize capital towards activities that contribute to climate change mitigation and adaptation, biodiversity conservation, and resource efficiency. Financial instruments in green finance include green bonds, green loans,...

Green Fuel

**Green fuel** refers to energy sources derived from renewable or low-carbon materials that can replace fossil fuels in transport, power generation, and industry while reducing greenhouse gas emissions. Also known as sustainable or alternative fuels, they include biofuels (such as bioethanol and biodiesel), biogas, hydrogen, ammonia, and sustainable aviation fuel (SAF). Green fuels are produced from feedstocks like plant matter, waste oils, algae, or captured carbon combined with renewable...

Green Hydrogen

**Green Hydrogen** is hydrogen produced by splitting water into hydrogen and oxygen using electricity from renewable sources such as wind, solar, or hydropower. This process, called electrolysis, emits no carbon dioxide, making it a fully sustainable fuel. Unlike grey hydrogen (made from natural gas) or blue hydrogen (which captures carbon emissions), green hydrogen is entirely clean and supports decarbonisation across multiple sectors. It can be stored and used for industry, transport,...

Green Infrastructure

**Green Infrastructure** refers to a strategically planned network of natural and semi-natural spaces that delivers a wide range of ecosystem services. These services include managing stormwater, improving air quality, providing wildlife habitats, and enhancing well-being through recreational opportunities. The core idea is to harness the power of nature to address urban and climatic challenges while promoting sustainable development. At its essence, green infrastructure combines both...

Green Investment

**Green Investment** refers to the allocation of capital towards projects, companies, or financial instruments that contribute positively to the environment and promote sustainability. This type of investment seeks to generate a financial return while simultaneously supporting environmental goals such as reducing carbon emissions, conserving natural resources, and fostering renewable energy. Green investments can take many forms, including equity in green companies, bonds issued for...

Green Job

A **Green Job** encompasses roles and occupations that directly contribute to preserving or restoring the environment and promoting sustainability. These jobs are integral to driving the transition from a carbon-intensive economy to one that is energy-efficient and low-carbon. Green jobs exist across various sectors, including renewable energy, waste management, conservation, and sustainable agriculture, among others. At their core, green jobs focus on reducing carbon footprints, improving...

Green Logistics

**Green Logistics** refers to the process of minimizing the ecological impact of logistics activities while maintaining efficiency and delivery standards. It encompasses a wide range of practices aimed at optimizing the supply chain, reducing waste, and minimizing carbon emissions. The core principles include incorporating environmentally-friendly transportation methods, energy-efficient warehousing, sustainable packaging, and leveraging technology to enhance operational efficiencies. In...

Green Manufacturing

**Green Manufacturing** refers to the practice of producing goods and services by employing processes that reduce environmental impact, conserve natural resources, and prioritize sustainability. This approach integrates eco-friendly techniques and green technologies to minimize waste, lower emissions, and utilize renewable materials. The primary goal is to create products that not only meet quality and efficiency standards but also contribute positively to the planet. Incorporating Green...

Green Marketing

**Green Marketing** refers to the practice of developing and promoting products or services based on their environmental benefits. This type of marketing encompasses a broad range of activities, from sustainable production processes and eco-friendly packaging to energy-efficient logistics and reduced carbon footprint. By emphasizing these green attributes, companies aim to meet the growing consumer demand for environmentally responsible products and foster a more sustainable future. Green...

Green Methanol

**Green methanol** is a low-emission form of methanol produced using renewable energy and sustainable carbon sources, designed to significantly reduce greenhouse gas emissions compared with conventional fossil-based methanol. It is typically manufactured by combining green hydrogen, generated through electrolysis powered by renewable electricity, with carbon captured from biogenic sources or directly from the air. Because the carbon used in production is recycled rather than extracted from...

Green Product Design

**Green Product Design** is the strategic and thoughtful process of creating products that have minimal environmental impact throughout their lifecycle. This approach considers every stage of a product's existence— from raw material sourcing, manufacturing, and usage, to end-of-life disposal. By prioritizing sustainability, businesses aim to reduce carbon footprints, conserve resources, and promote a circular economy. Key principles of Green Product Design include using renewable and...

Green Public Procurement

**Green Public Procurement (GPP)** refers to the process by which public authorities seek to procure goods, services, and works with a reduced environmental impact throughout their life cycle. By prioritizing eco-friendly alternatives, GPP drives markets towards innovations that protect the environment, promote sustainable development, and enhance energy efficiency. This strategic approach aims to utilize the substantial purchasing power of the public sector to foster a greener economy. GPP...

Green Retrofitting

**Green Retrofitting** is the process of modifying existing buildings and infrastructure to enhance energy efficiency, reduce environmental impact, and promote sustainability. Unlike new constructions that can be designed with the latest eco-friendly materials and technologies from the start, green retrofitting focuses on improving and updating what is already in place. This practice can include a range of modifications such as installing energy-efficient lighting and HVAC systems, improving...

Green Revolving Fund (GRF)

A **Green Revolving Fund (GRF)** is an internal, self-replenishing pool of capital dedicated to financing sustainability upgrades within an organization. It initially pays for projects that reduce resource consumption, such as energy efficiency retrofits, water conservation measures, or renewable energy installations. The operational cost savings generated by these projects are then tracked and returned to the fund. This "revolving" mechanism replenishes the capital, allowing the organization...

Green Roofs

**Green Roofs** are specially designed roofing systems that incorporate vegetation and soil over a waterproof membrane, providing a range of environmental, economic, and social benefits. Unlike traditional roofing materials like shingles or asphalt, green roofs offer a sustainable alternative by creating a layer of greenery atop buildings, enhancing urban biodiversity and aesthetics. There are primarily two types of green roofs: extensive and intensive. Extensive green roofs are lightweight...

Greenhouse Gas Emission Factors

**Greenhouse Gas Emission Factors** are critical metrics used to quantify the greenhouse gases (GHGs) emitted from various sources, relative to a specific activity or process. These factors are expressed typically in terms of emissions per unit of activity, such as kilograms of CO2 equivalent per kilowatt-hour of electricity generated, or per kilometer traveled by vehicle. By providing a standardized way to measure and report emissions, they serve as essential tools for businesses,...

Greenhouse Gas Emission Scope

**Greenhouse Gas Emission Scope** refers to the categorization of emissions from various activities related to an organization's operations. These scopes help in systematically quantifying and managing the emissions to mitigate the impact on climate change. The term is defined by the Greenhouse Gas Protocol, which classifies emissions into three distinct categories: 1. **Scope 1**: Direct emissions from owned or controlled sources. These include emissions from combustion in owned or...

Greenhouse Gas Fluxes

**Greenhouse Gas Fluxes** refer to the dynamic movement and exchange of greenhouse gases (GHGs) between the Earth’s atmosphere, oceans, and terrestrial ecosystems. GHGs, such as carbon dioxide (CO2), methane (CH4), and nitrous oxide (N2O), play a crucial role in regulating the Earth's climate by trapping heat and maintaining the planet's energy balance. The flux of these gases can occur through natural processes such as photosynthesis, respiration, and decomposition, as well as through...

Greenhouse Gas Inventory

A **Greenhouse Gas Inventory** is a comprehensive accounting of all greenhouse gas emissions and removals associated with a specific entity, such as a country, organization, or project, over a defined time period. It involves systematically collecting, analyzing, and reporting data on the various sources of greenhouse gases like carbon dioxide (CO₂), methane (CH₄), and nitrous oxide (N₂O), among others. This inventory serves as a crucial tool for understanding our impact on climate change and...

Greenhouse Gas Mitigation

**Greenhouse Gas Mitigation** refers to the strategies and actions undertaken to reduce or prevent the emission of greenhouse gases (GHGs) into the atmosphere. These gases, which include carbon dioxide (CO₂), methane (CH₄), nitrous oxide (N₂O), and fluorinated gases, trap heat in the earth's atmosphere, leading to global warming and climate change. By implementing mitigation measures, we aim to stabilize or reduce the concentration of GHGs, thus limiting their impact on our environment and...

Greenhouse Gas Protocol

The **Greenhouse Gas Protocol** (GHG Protocol) is the world's most widely used framework for measuring and managing greenhouse gas (GHG) emissions. Developed through a decade-long partnership between the World Resources Institute (WRI) and the World Business Council for Sustainable Development (WBCSD), the GHG Protocol provides comprehensive global standardized frameworks to measure and manage GHG emissions from private and public sector operations, value chains, and mitigation actions. The...

Greenhouse Gas Radiative Forcing

**Greenhouse Gas Radiative Forcing** refers to the change in energy balance in the Earth's atmosphere due to the presence of greenhouse gases. These gases, such as carbon dioxide (CO₂), methane (CH₄), and nitrous oxide (N₂O), absorb and emit infrared radiation, leading to a warming effect known as the greenhouse effect. The concept of radiative forcing quantifies this effect by measuring the difference in energy flux (incoming solar radiation vs. outgoing infrared radiation) at the top of the...

Greenhouse Gases (GHGs)

**Greenhouse Gases (GHGs)** are atmospheric gases that trap heat from the sun, creating a "greenhouse effect" that warms the Earth. Among the most significant GHGs are carbon dioxide (CO₂), methane (CH₄), nitrous oxide (N₂O), and fluorinated gases, each differing in both their warming potential and their lifespan in the atmosphere. These gases are emitted through a variety of activities, including the burning of fossil fuels, industrial processes, agricultural practices, and...

Greenwashing

**Greenwashing** is a deceptive practice where a company exaggerates or falsely claims the environmental benefits of a product, service, or policy to appear more environmentally friendly than it actually is. This can mislead consumers and undermine genuine sustainability efforts. Identifying greenwashing involves scrutinizing the claims made, looking for concrete evidence, and checking for third-party certifications or verifications.

GRESB (Global Real Estate Sustainability Benchmark)

**GRESB (Global Real Estate Sustainability Benchmark)** is an international standard for assessing the environmental, social, and governance (ESG) performance of real estate and infrastructure portfolios. Founded in 2009, it benchmarks companies and funds based on data covering energy use, greenhouse gas emissions, water, waste, and stakeholder engagement. GRESB helps investors and managers evaluate sustainability risks and opportunities, promoting transparency, accountability, and continuous...

Grid Dependency

**Grid dependency** describes how reliant a building or facility is on the central electrical grid. It is used in discussions of energy autonomy or off-grid living.

Grid Integration of Wind Energy

**Grid Integration of Wind Energy** refers to the methodical process of connecting wind energy generation systems to the existing electrical grid in a manner that ensures reliability, efficiency, and economic viability. This intricate integration involves the seamless incorporation of wind turbines and wind farms into the broader energy infrastructure, balancing supply and demand to maintain grid stability. Given the intermittent nature of wind, this integration requires advanced...

Grid Parity

**Grid Parity** is a key milestone in the renewable energy sector, referring to the point at which the cost of generating electricity from renewable sources, like solar or wind, becomes equal to or less than the cost of purchasing power from the conventional electrical grid. This phenomenon is a crucial indicator of the competitiveness and financial viability of renewable energy technologies in comparison to traditional fossil fuels. Achieving grid parity signifies a transformative moment in...

Grid-Enhancing Technologies (GETs)

**Grid-Enhancing Technologies (GETs)** are advanced solutions designed to optimize the efficiency, capacity, and reliability of existing power grids without requiring major infrastructure upgrades. These technologies encompass dynamic line rating systems that monitor real-time weather and line conditions to safely increase transmission capacity beyond static limits, as well as advanced power flow control devices that direct electricity along underutilized pathways to reduce congestion....

Grid-Tied Solar System

A **Grid-Tied Solar System** is a type of solar photovoltaic (PV) system that is directly interconnected with the public electricity grid. This setup allows homeowners and businesses to seamlessly integrate solar power generation with their existing power supply, providing a sustainable energy solution that reduces overall electricity costs. Unlike off-grid systems, which rely solely on stored solar energy and require battery backups, grid-tied systems draw on the grid when the solar panels...