地球温暖化とは大気中の二酸化炭素（ＣＯ2）など、熱を吸収する性質がある「温室効果ガス」が、人間の経済活動などに伴って増加する一方、森林の破壊などによってＣＯ2の吸収が減少することにより、地球全体の気温が上昇する現象のこと。異常気象や自然生態系、農業への影響などが心配される。
Ｇlobal Warming
Choose the correct answer.
1. The U. S. Geological Survey has predicted that _______ of the world's polar bear sub-populations will be extinct by mid-century due to melting of the Arctic ice cap.
a) all
b) one-fifth
c) two-thirds
2. Scientists say that unless we curb global warming emissions, average U.S. temperatures could be ＿＿＿＿ degrees higher by the end of the century.
a) 0.5 to 1
b) 10 to 16
c) 3 to 9
3. What country is the largest source of global warming pollution?
a) The United States.
b) Japan.
c) Australia.
4. Coal-burning power plants are the largest U.S. source of carbon dioxide pollution -- they produce＿＿＿＿ tons every year.
a) 2.5
b) 2.5 million
c) 2.5 billion
5. Rising sea levels will lead ______ coastal flooding on the Eastern seaboard, in Florida, and in other areas, such as the Gulf of Mexico.
a) of
b) in
c) to
6.The latest scientific data confirm that the earth's climate is rapidly _______.
a) changing
b) changed
c) changes
7. The increase in global temperatures is expected to disrupt ecosystems and result ＿＿＿＿ loss of species diversity, as species that cannot adapt die off.
a) out
b) to
c) in
8. Current rates of sea-level rise are ＿＿＿＿ to increase as a result both of thermal expansion of the oceans and melting of most mountain glaciers and partial melting of the West Antarctic and Greenland ice caps.
a) expected
b) expecting
c) expect
9.The ocean will continue to become more acidic due _____ carbon dioxide emissions.
a) to
b) of
c) with
10.Some polar bears are _______ because they have to swim longer distances to reach ice floes.
a) drown
b) drowned
c) drowning
Hiroma Tabuchi