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The Greenhouse Effect
How the Greenhouse Effect Works
● Sunlight reaches the Earth's surface.
● Some of the sunlight is reflected back into space.
● Some of the sunlight is absorbed by the Earth's surface and re-emitted
as infrared radiation.
● Greenhouse gases in the atmosphere absorb some of the infrared
radiation and re-emit it in all directions, including back towards the
Earth's surface.
● This process traps heat in the atmosphere, keeping the Earth warm.
Greenhouse Gases
● Carbon dioxide (CO2) is the most important greenhouse gas, accounting
for about 64% of all greenhouse gas emissions.
● Methane (CH4) is the second most important greenhouse gas,
accounting for about 19% of all greenhouse gas emissions.
● Nitrous oxide (N2O) accounts for about 6% of all greenhouse gas
emissions.
● Fluorinated gases (F-gases) account for about 4% of all greenhouse gas
emissions
The Enhanced Greenhouse Effect
● Human activities have increased the concentration of greenhouse gases
in the atmosphere to levels not seen in millions of years.
● This increase in greenhouse gas concentrations is causing the Earth to
warm at an unprecedented rate.
Global Warming
● Global warming is the increase in the average temperature of the
Earth's near-surface air and oceans.
● Global warming is caused by the enhanced greenhouse effect
Impacts of Global Warming
● Rising sea levels: Global warming is causing sea levels to rise, which is inundating
coastal communities and putting ecosystems at risk.
● Extreme weather events: Global warming is making extreme weather events, such as
heat waves, droughts, floods, and wildfires, more frequent and severe.
● Melting glaciers and ice sheets: Global warming is causing glaciers and ice sheets to
melt, which is contributing to sea level rise and disrupting freshwater supplies.
● Loss of biodiversity: Global warming is causing a loss of biodiversity, as plants and
animals are unable to adapt to the changing climate

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The Greenhouse Effect: A Natural Process with Human-Caused Implications

  • 2. How the Greenhouse Effect Works ● Sunlight reaches the Earth's surface. ● Some of the sunlight is reflected back into space. ● Some of the sunlight is absorbed by the Earth's surface and re-emitted as infrared radiation. ● Greenhouse gases in the atmosphere absorb some of the infrared radiation and re-emit it in all directions, including back towards the Earth's surface. ● This process traps heat in the atmosphere, keeping the Earth warm.
  • 3. Greenhouse Gases ● Carbon dioxide (CO2) is the most important greenhouse gas, accounting for about 64% of all greenhouse gas emissions. ● Methane (CH4) is the second most important greenhouse gas, accounting for about 19% of all greenhouse gas emissions. ● Nitrous oxide (N2O) accounts for about 6% of all greenhouse gas emissions. ● Fluorinated gases (F-gases) account for about 4% of all greenhouse gas emissions
  • 4. The Enhanced Greenhouse Effect ● Human activities have increased the concentration of greenhouse gases in the atmosphere to levels not seen in millions of years. ● This increase in greenhouse gas concentrations is causing the Earth to warm at an unprecedented rate.
  • 5. Global Warming ● Global warming is the increase in the average temperature of the Earth's near-surface air and oceans. ● Global warming is caused by the enhanced greenhouse effect
  • 6. Impacts of Global Warming ● Rising sea levels: Global warming is causing sea levels to rise, which is inundating coastal communities and putting ecosystems at risk. ● Extreme weather events: Global warming is making extreme weather events, such as heat waves, droughts, floods, and wildfires, more frequent and severe. ● Melting glaciers and ice sheets: Global warming is causing glaciers and ice sheets to melt, which is contributing to sea level rise and disrupting freshwater supplies. ● Loss of biodiversity: Global warming is causing a loss of biodiversity, as plants and animals are unable to adapt to the changing climate