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People still talk about global warming as if it will only impact future generations. The reality is different. Climate change is causing catastrophic changes today.

North American forests are being devasted by the mountain pine beetle. It's been around for a long time, but does not thrive in areas that 'normally' experience severe cold – such as the Canadian pine forests. However, progressively warmer winters in Canada have led to an unprecedented infestation that will have a severe economic effect on both the communites that manage these woodlands and the supply of pine itself.

This Washington Post article details some of these effects.