Where would you find a cold desert biome?
About _______ percent of current carbon dioxide emissions are being absorbed into the planet’s oceans.
According to the EPA, the second most significant factor in human-caused global warming and climate change is
b)burning of fossil fuels.
The current rate of species extinction is conservatively estimated at _______ times greater than the background rate.
a)20 to 200
b)50 to 5,000
c)100 to 1,000
d)300 to 3,000
Hydrofluorocarbons (HFCs) have largely replaced chlorofluorocarbons (CFCs) in an effort to reduce ozone layer depletion. What is a drawback to this strategy?
a)HFCs have an unpleasant odor.
b)HFCs are also greenhouse gases.
c)HFCs are more expensive to produce.
d)HFCs are toxic to wildlife.
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