I think it'd have to be concentrated, and a stepped process. We wouldn't want to stick a huge pair of sunglasses on the Earth then realise all our crops are dying.
However the article is true, we're a developed enough race to create techonology to help us. But as Rolypig said, it's limitation will be the greed of politicans and governments. It may allow Africa to become the strongest superpower, and that wouldn't go down very well would it.
Maybe they'd sell the shade for £100 per metre? If you default they remove the panel on the satellite :-P
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