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When is solar and wind expected to power half of the globe?david2019-12-17T21:18:49+00:00
What percentage of the Sahara Desert could provide all the energy needs of the world today?david2019-12-18T09:15:29+00:00
How much more efficient is it to produce items from recycled materials vs raw materials?david2019-12-17T21:19:16+00:00
How many trees could provide enough forest land to store 205 billion metric tons of carbon?david2019-12-17T21:19:30+00:00
