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