题目内容
Controversy and concerns relate to the large amount of ______ land required for crops and its impact on grain supply.
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Brazil now ranks ______ in the world in carbon emissions, and most of its emissions come from deforestation.
With large amounts of money from governments and big companies, this ______ pursuit of bio-fuels is threatening the whole world.
The ______ to staying in that dead-end job is to quit.
Politicians and big companies believe ______ are alternative sources of energy
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