9.2 Carbon dioxide and methane as greenhouse gases

• What processes produce methane?

  Agriculture, landfills, natural gas
• Which greenhouse gas has a higher global warming potential, carbon dioxide or methane?

  Methane
• Carbon dioxide has a longer atmospheric lifetime than methane


  True
• Methane has a higher global warming potential than carbon dioxide over a 100-year period


  True
• The greenhouse effect is a natural process vital for life on Earth.


  True
• Methane has a higher global warming potential than CO2
• Steps in the greenhouse effect process

  1️⃣ Greenhouse gases trap infrared radiation

  2️⃣ Earth remains warm

  3️⃣ Human activities increase greenhouse gas concentrations

  4️⃣ Climate change occurs
• Methane has a higher global warming potential but shorter atmospheric lifetime compared to CO2
• Greenhouse gases allow sunlight to pass through but prevent infrared radiation from escaping


  True
• Increased CO2 levels from human activities enhance the greenhouse effect

  True
• Order the steps in the process of methane production from agriculture:

  1️⃣ Livestock farming

  2️⃣ Rice cultivation

  3️⃣ Manure management
• Methane has a shorter atmospheric lifetime compared to CO2

  True
• CO2 originates from burning fossil fuels and deforestation
• The enhanced greenhouse effect is primarily caused by human-induced increases in greenhouse gas levels
• Increased CO2 levels in the atmosphere lead to increased ocean acidity
• What are greenhouse gases?

  Gases that trap heat
• Greenhouse gases allow sunlight to pass through but prevent infrared radiation from escaping into space


  True
• What is the atmospheric lifetime of methane?

  12 years
• Which agricultural activity releases methane?

  Livestock farming
• Order the greenhouse gases by their atmospheric lifetime from shortest to longest:

  1️⃣ Methane (12 years)

  2️⃣ Carbon dioxide (100-300 years)
• Water vapor is a greenhouse gas influenced by temperature


  True
• Steps in the release of CO2 from human activities

  1️⃣ Burning fossil fuels

  2️⃣ Deforestation

  3️⃣ Natural respiration

  4️⃣ Volcanic eruptions
• Methane has a shorter atmospheric lifetime compared to CO2.


  True
• Match the greenhouse gas with its primary impact:

  Carbon Dioxide ↔️ Traps heat, increases global temperature

  Methane ↔️ Potent heat trapper, shorter lifespan
• Greenhouse gases trap heat from the sun, causing the greenhouse effect


  True
• Methane has an atmospheric lifetime of approximately 12 years
• Carbon dioxide has an atmospheric lifetime of 100-300 years
• Methane, like CO2, absorbs and traps infrared radiation

  True
• What is the primary driver of increased methane levels in the atmosphere?

  Human activities
• How do methane and CO2 differ in terms of global warming potential and atmospheric lifetime?

  Methane higher warming potential, shorter lifetime
• What are the environmental concerns associated with rising global temperatures?

  Heatwaves, melting ice, ecosystem disruption
• Greenhouse gases trap heat from the sun, causing the **greenhouseeffect
• Both carbon dioxide and methane have strong infrared absorption
• Deforestation increases atmospheric CO2 levels because it removes trees that absorb CO2
• Methane is the main component of natural gas.
• What is the role of nitrous oxide (N2O) in the atmosphere?

  Greenhouse gas
• Greenhouse gases trap heat from the sun, causing the greenhouse
• Match the source of methane with its primary release activity:

  Agriculture ↔️ Livestock farming

  Landfills ↔️ Decomposition of organic waste

  Natural gas ↔️ Production and distribution
• Methane has a global warming potential of 28-36 over a 100-year period
• Methane has a shorter atmospheric lifetime of around 12 years