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【单选题】The work on atmospheric chlorofiuorocarbons (氯氟化碳) led eventually to a global CFC ban that saved us from ozone-layer reduction. Do we have time to do a similar thing with carbon emissions to save ours...
A.
it can produce charcoal most of which can be used as fuel
B.
it doesn’t involve any international cooperation or negotiation
C.
it brings extra income to farmers and saves government money
D.
it needs no advanced technology or expensive equipment