What percentage of the world’s population today relies on wood and other biomass for cooking and heating?
A. 10 percent
B. 20 percent
D. 40 percent
Submit your answer in the comments below for your chance to win a prize worth £25!
The entry period is from 9th June 2014 to 9th July 2014.
All entries must be received by midnight on 9th July 2014.
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