Nat Geo Video: Understanding Climate Change

What is the main cause of the increase in Earth's temperature?

• Solar flares

• Greenhouse effect

• Ozone layer depletion

• Decrease in plant life

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Which gas is not a greenhouse gas?

• Oxygen

• Methane

• Carbon dioxide

• Nitrous oxide

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What effect do greenhouse gases have on the sun's light and heat?

• Allow light in and trap heat

• Block both light and heat

• Allow both light and heat to escape

• Reflect both light and heat back to space

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Since the Industrial Revolution, how has human activity affected the amount of CO2 in the atmosphere?

• Increased by more than a third

• Decreased by half

• Remained constant

• Increased by a tenth

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What is a direct consequence of melting ice sheets?

• Rising sea levels

• Increased land mass

• Decreased ocean temperatures

• More forested areas

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How does climate change affect weather patterns?

• Decreased storm frequency

• More predictable weather

• More extreme weather

• Cooler temperatures globally

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What is one health problem exacerbated by higher levels of smog?

• Hearing loss

• Vision impairment

• Broken bones

• Asthma

What can replace fossil fuels to help combat climate change?

• Renewable energy sources

• Coal

• Nuclear weapons

• Plastic materials

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What historical comparison is made about atmospheric carbon dioxide levels?

• Highest in hundreds of thousands of years

• Lowest in decades

• Same as a million years ago

• No change from prehistoric times

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What happens to glaciers as a result of global warming?

• They become forests

• They turn into deserts

• They grow larger

• They melt

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