I used to think that planting trees was the only solution to desertification. But after watching this I realised I was wrong. Cattle can be used to reclaim land, making it possible to grow crops on what was semi-arid land.
According to WHO (the World Health Organisation), 7 million people die annually from air pollution. That is one reason why some climate scientists are beginning to re-examine nuclear.
We must weigh up the costs of using nuclear power against the cost of not using it. See James Hansen & Michael Shellenberger: Nuclear Power? Are Renewables Enough?
Some environmentalists believe that we should be less concerned about carbon dioxide and more concerned about other pollutants, as carbon dioxide helps plant growth.