In 1950
in 2012
Images courtesy of NASA
If a student wants to understand what has led to this change, what is the best scientific question he or she could ask an ex
OA
How many different ways do humans generate energy from fossil fuels?
ов.
Are renewable energy resources better for the environment than nonrenewable ones?
OC
How does global warming impact cities along the world's coastlines?
OD
What processes cause global temperatures to change from one year to another?
cause
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