Climatologist Andrew Weaver, at the University of Victoria, says this year's heat wave is just a shadow of life in a greenhouse world.
"The thing to say is, you ain't seen nothing yet. To say this is a glimpse is probably one of the greatest understatements of all time. The projections of what is likely to happen in this century would put events like this as minor."
John Bennett of the Sierra Club says the weather across the Canada - not only the heat wave in Ontario but the droughts, downpours and floods in other regions - are consistent with what computer models predict.
"We may in fact be seeing real changes linked to climate change now but even if this is just some freak weather this is what we have to look forward to in the future."
Somehow there's a lot less joy in being right when the result is as unfortunate as this. But it should be fairly easily acknowledged by now that there's no real debate over the existence or effect of climate change - the only question is whether we're looking ahead enough to do something substantial about it.
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