I used to think that planting trees was the only solution to desertification. But after watching this I realised I was wrong.
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 way up the costs of using nuclear power against the cost of not using it. See James Hansen & Michael Shellenberger: Nuclear Power? Are Renewables Enough?