At Australia’s Bunny Fence, Variable Cloudiness Prompts Climate Study

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You've heard of urban heat islands. Now researchers have confirmed the existence of their opposite: cool farm patches.

Whereas urban development generates pockets of hot air, irrigated fields tend to cool things down, they say - and there is evidence that the effects have been felt in California for over a century.

http://environment.newscientist.com/...l-warming.html