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What is the rise in the Earth's average surface temperature over the last 100 years called?
deforestation
climate change
carbon dioxide
global warming
Which of the following is NOT a greenhouse gas?
methane
oxygen
water vapor
carbon dioxide
Which of the following is known to reflect sunlight back into the atmosphere and help cool the planet?
carbon dioxide
aerosol
melanin
methane
What is one positive aspect of global warming?
farmers get longer growing seasons
glaciers are melting
there is less rain
there are more mudslides
How much is the population on Earth supposed to increase by 2050?
6 billion
4 billion
8 billion
3 billion
