The Ultimate Glossary of Climate Change Terms (2025 Edition)
đź“ť Rosa Matthews
🗓️ Apr 7, 2025
Photo by cottonbro studio
Welcome to your go-to glossary for navigating the evolving language of climate change in 2025. Whether you’re a student, writer, educator, or just climate-curious, these quick definitions will help you keep up with the conversation—from policy and tech to nature and solutions. Use this A–Z guide to stay informed, connected, and ready to engage.
A
Adaptation: Changes and planning aimed at reducing damage from climate impacts—like building flood defences or adjusting farming practices.
Afforestation: Planting trees in areas where there were none before to help absorb COâ‚‚ from the air.
Anthropogenic: Caused by human activities, especially referring to climate change driven by fossil fuel use and industrialisation.
B
BECCS (Bioenergy with Carbon Capture and Storage): A process using plants for energy while capturing and storing the COâ‚‚, preventing it from reaching the atmosphere.
Biodiversity Loss: The decline in plant and animal species, often due to climate change, pollution, or habitat destruction.
C
Carbon Capture and Storage (CCS): Technology that collects COâ‚‚ from industrial sources and stores it underground to prevent emissions.
Carbon Credit: A tradable certificate allowing the emission of a certain amount of COâ‚‚. Used in emissions trading schemes.
Carbon Footprint: The total greenhouse gas emissions caused directly or indirectly by an individual, organisation, or activity.
Carbon Neutral: When any emitted carbon is balanced by actions to remove or offset the same amount from the atmosphere.
Circular Economy: A system where resources are reused, repaired, or recycled to reduce waste and emissions.
Climate Change: Long-term changes in weather and temperature patterns, primarily driven by human activities.
Climate Crisis: An urgent framing of climate change, highlighting its accelerating impacts on ecosystems and human life.
Climate Finance: Funding provided to reduce emissions and support climate resilience, especially in developing countries.
Climate Justice: A principle that addresses the unequal impacts of climate change and calls for fair, inclusive solutions.
D
Direct Air Capture: Technology that pulls COâ‚‚ directly from the air and stores it. Still being tested at large scales.
Drought: Extended periods without rainfall, leading to dry soil, water shortages, and stressed ecosystems.
E
Ecosystem-Based Adaptation: Using nature-based solutions—like forests or wetlands—to reduce climate-related risks such as flooding or extreme heat.
Emissions: Greenhouse gases released into the atmosphere from sources like fossil fuels and agriculture.
Energy Efficiency: Getting the same output using less energy—like LED bulbs or insulated buildings.
F
Flooding: Overflowing water caused by storms, heavy rain, or rising sea levels—becoming more common with climate change.
Fossil Fuels: Coal, oil, and natural gas. Burning them is the main driver of global COâ‚‚ emissions.
G
Global Warming: The increase in Earth’s average surface temperature due to rising greenhouse gas levels.
Greenhouse Effect: The process by which greenhouse gases trap heat in the atmosphere—natural, but intensified by human activity.
Greenhouse Gases (GHGs): Gases like COâ‚‚, methane, and nitrous oxide that trap heat and drive climate change.
H
Heatwave: A prolonged period of excessive heat, often dangerous to health and made more common by climate change.
Hydropower: Renewable energy generated from moving water—like rivers and dams. Can disrupt ecosystems if not managed carefully.
I
Injection Well: A deep well used to store captured COâ‚‚ underground as part of carbon removal strategies.
IPCC (Intergovernmental Panel on Climate Change): The UN body that reviews climate science and advises governments worldwide.
J
Just Transition: The concept of moving to a green economy in a way that supports workers and communities, especially those reliant on fossil fuels.
K
Kyoto Protocol: A 1997 international treaty that committed countries to reduce emissions. Predecessor to the Paris Agreement.
L
Low-Carbon Economy: An economy built on renewable energy, energy efficiency, and low-emission technologies.
M
Maladaptation: A climate solution that accidentally causes more harm than good—like increasing flood risks nearby. Mitigation: Actions to reduce or prevent greenhouse gas emissions, such as switching to clean energy or reforestation.
N
Natural Capital: Natural resources like forests, air, and water that support human life and economies. Net Zero: When greenhouse gas emissions are balanced out by removals, resulting in no net increase in the atmosphere.
O
Offsetting: Paying for activities like tree planting or clean energy to compensate for one’s own emissions.
P
Paris Agreement: The 2015 international treaty in which countries pledged to limit global warming to well below 2°C. Permafrost: Permanently frozen ground in polar regions. When it melts, it can release methane and CO₂.
Q
Quantified Goal (in Climate Finance): A set financial target for supporting climate solutions, usually agreed among nations.
R
Renewable Energy: Energy from natural sources that don’t run out—like solar, wind, and hydro. Resilience: The ability of communities or systems to recover quickly from climate shocks like storms or droughts.
S
Sea-Level Rise: Oceans are rising due to melting ice and warming water, threatening coastal areas worldwide. Sustainability: Using resources in a way that meets today’s needs without harming future generations' ability to do the same.
T
Tipping Point: A moment when climate systems shift suddenly and irreversibly—like ice sheet collapse or rainforest dieback.
U
Urban Heat Island: Cities are often hotter than surrounding areas due to concrete and lack of greenery absorbing heat.
V
Vulnerability: How sensitive or exposed something is to climate risks, and how well it can adapt or cope.
W
Wildfire: Uncontrolled fires in forests or grasslands, often worsened by drought and extreme heat.
X
Xeriscaping: Landscaping that uses drought-resistant plants to conserve water—especially useful in arid regions.
Y
Youth Climate Action: Young people leading movements, campaigns, and innovations for urgent climate solutions.
Z
Zero-Carbon Energy: Energy sources that produce no greenhouse gas emissions—like solar, wind, and nuclear.