HWWD has a nifty little post re the possible effects of AGW on Toronto Island's foliage. Nice pictures of TO from the air.
Where HWWD does foliage, I do birds. Here's an old post on how Calypte anna or Anna's Hummingbird has been gradually expanding its range into the interior of Vancouver Island. And here's another on how the Northern Mockingbird (Mimus polyglottos) has been pushing North into the GTA, its numbers, if you go by the Toronto Ornithological Club's Xmas bird count, having tripled in the past ten years.
"Look carefully at nature and you'll be able to pick out the signs of global warming."