Asked by Pixa
What are green house gases?
All Answers 1
Answered by
GPT-5 mini
AI
You mean “greenhouse gases.” Briefly:
Definition
- Greenhouse gases (GHGs) are atmospheric gases that absorb and re‑emit infrared (longwave) radiation from Earth’s surface. By trapping heat they produce the greenhouse effect, which keeps the planet warmer than it would be without them.
Major greenhouse gases and sources
- Water vapor (H2O) — the most abundant GHG; acts as a feedback (warmer air holds more moisture) rather than a direct driver of long‑term climate change.
- Carbon dioxide (CO2) — from burning fossil fuels, cement production, deforestation and land‑use change; the primary long‑term driver of recent global warming.
- Methane (CH4) — from wetlands, ruminant animals, rice paddies, landfills and fossil‑fuel leakage; more potent than CO2 per molecule but shorter‑lived.
- Nitrous oxide (N2O) — mainly from agricultural fertilizers and some industrial processes.
- Ozone (O3) — tropospheric (ground‑level) ozone is a greenhouse gas and air pollutant; stratospheric ozone shields UV and is different in effect.
- Fluorinated gases (CFCs, HCFCs, HFCs, SF6, etc.) — synthetic gases used in refrigeration, industry and electronics; often very strong GHGs with long atmospheric lifetimes.
How they warm the planet
- Sunlight (shortwave) reaches Earth and warms the surface. The surface emits infrared radiation (longwave). GHGs absorb much of this infrared energy and re‑emit it in all directions, including back toward the surface, raising the average temperature.
Important properties
- Global warming potential (GWP): a measure of how much heat a gas traps over a given time relative to CO2 (e.g., methane has a much higher GWP over 20–100 years).
- Atmospheric lifetime: determines how long a gas stays and influences climate (CO2 has a long tail of centuries to millennia; methane ~ a decade; some fluorinated gases last thousands of years).
Why it matters
- Increasing concentrations of greenhouse gases from human activities are the main cause of recent climate change—higher temperatures, changing weather patterns, sea‑level rise, and more extreme events.
Ways to reduce emissions (examples)
- Cut fossil fuel use (energy efficiency, renewables).
- Reduce methane leaks and manage agricultural sources.
- Improve fertilizer use and soil management.
- Phase down high‑GWP refrigerants and industrial gases.
- Protect and restore forests and other carbon sinks.
If you want, I can explain the greenhouse effect with a simple diagram or give current concentration numbers and radiative forcing for each gas.
Definition
- Greenhouse gases (GHGs) are atmospheric gases that absorb and re‑emit infrared (longwave) radiation from Earth’s surface. By trapping heat they produce the greenhouse effect, which keeps the planet warmer than it would be without them.
Major greenhouse gases and sources
- Water vapor (H2O) — the most abundant GHG; acts as a feedback (warmer air holds more moisture) rather than a direct driver of long‑term climate change.
- Carbon dioxide (CO2) — from burning fossil fuels, cement production, deforestation and land‑use change; the primary long‑term driver of recent global warming.
- Methane (CH4) — from wetlands, ruminant animals, rice paddies, landfills and fossil‑fuel leakage; more potent than CO2 per molecule but shorter‑lived.
- Nitrous oxide (N2O) — mainly from agricultural fertilizers and some industrial processes.
- Ozone (O3) — tropospheric (ground‑level) ozone is a greenhouse gas and air pollutant; stratospheric ozone shields UV and is different in effect.
- Fluorinated gases (CFCs, HCFCs, HFCs, SF6, etc.) — synthetic gases used in refrigeration, industry and electronics; often very strong GHGs with long atmospheric lifetimes.
How they warm the planet
- Sunlight (shortwave) reaches Earth and warms the surface. The surface emits infrared radiation (longwave). GHGs absorb much of this infrared energy and re‑emit it in all directions, including back toward the surface, raising the average temperature.
Important properties
- Global warming potential (GWP): a measure of how much heat a gas traps over a given time relative to CO2 (e.g., methane has a much higher GWP over 20–100 years).
- Atmospheric lifetime: determines how long a gas stays and influences climate (CO2 has a long tail of centuries to millennia; methane ~ a decade; some fluorinated gases last thousands of years).
Why it matters
- Increasing concentrations of greenhouse gases from human activities are the main cause of recent climate change—higher temperatures, changing weather patterns, sea‑level rise, and more extreme events.
Ways to reduce emissions (examples)
- Cut fossil fuel use (energy efficiency, renewables).
- Reduce methane leaks and manage agricultural sources.
- Improve fertilizer use and soil management.
- Phase down high‑GWP refrigerants and industrial gases.
- Protect and restore forests and other carbon sinks.
If you want, I can explain the greenhouse effect with a simple diagram or give current concentration numbers and radiative forcing for each gas.
Submit Your Answer
We prioritize human answers over AI answers.
If you are human, and you can answer this question, please submit your answer.