Asked by bob
Identify and analyze the way fossil fuel combustion has changed the composition of Earth's atmosphere, and the way this change has affected climate.(4 points)
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1) Change in atmospheric composition (identification)
- Burning coal, oil and gas has greatly increased concentrations of CO2 (from ~280 ppm pre‑industrial to ~420 ppm today) and also raised atmospheric methane (CH4) and nitrous oxide (N2O). Combustion and industrial processes have increased tropospheric ozone and emitted aerosols (sulfates, black carbon) and other pollutants.
2) How that change affects climate (mechanism/analysis)
- CO2, CH4 and N2O are long‑lived greenhouse gases that absorb outgoing longwave (infrared) radiation from Earth’s surface. Higher concentrations increase the greenhouse effect, reducing outgoing heat and raising the planet’s energy balance and surface temperature.
3) Observed and projected climate consequences
- The enhanced greenhouse effect has driven global mean warming (roughly +1.1°C since the late 19th century), altered precipitation patterns, increased the frequency/intensity of heatwaves and heavy precipitation events, accelerated melting of glaciers and sea ice, and contributed to sea‑level rise through thermal expansion and ice loss.
4) Additional impacts and feedbacks
- CO2 uptake by the oceans causes ocean acidification (surface pH down by ≈0.1 units since pre‑industrial), harming marine life. Aerosols from combustion can locally cool the climate by scattering sunlight and changing cloud properties, partially offsetting warming but worsening air quality. Warming also triggers feedbacks (e.g., reduced ice albedo, permafrost thaw releasing more CH4) that amplify future warming.
(These points together explain how fossil fuel combustion has changed atmospheric composition and driven the contemporary changes in climate.)
- Burning coal, oil and gas has greatly increased concentrations of CO2 (from ~280 ppm pre‑industrial to ~420 ppm today) and also raised atmospheric methane (CH4) and nitrous oxide (N2O). Combustion and industrial processes have increased tropospheric ozone and emitted aerosols (sulfates, black carbon) and other pollutants.
2) How that change affects climate (mechanism/analysis)
- CO2, CH4 and N2O are long‑lived greenhouse gases that absorb outgoing longwave (infrared) radiation from Earth’s surface. Higher concentrations increase the greenhouse effect, reducing outgoing heat and raising the planet’s energy balance and surface temperature.
3) Observed and projected climate consequences
- The enhanced greenhouse effect has driven global mean warming (roughly +1.1°C since the late 19th century), altered precipitation patterns, increased the frequency/intensity of heatwaves and heavy precipitation events, accelerated melting of glaciers and sea ice, and contributed to sea‑level rise through thermal expansion and ice loss.
4) Additional impacts and feedbacks
- CO2 uptake by the oceans causes ocean acidification (surface pH down by ≈0.1 units since pre‑industrial), harming marine life. Aerosols from combustion can locally cool the climate by scattering sunlight and changing cloud properties, partially offsetting warming but worsening air quality. Warming also triggers feedbacks (e.g., reduced ice albedo, permafrost thaw releasing more CH4) that amplify future warming.
(These points together explain how fossil fuel combustion has changed atmospheric composition and driven the contemporary changes in climate.)
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