The world's national parks and protected areas are supposed to provide sanctuary from the ravages of humankind's assault on nature, but no park boundary or conservation law can protect an ecosystem from climate change. A new report by the World Wide Fund For Nature (WWF) shows that this insidious and invisible killer is invading our most cherished natural areas, even as governments stand by and debate the costs of action.

The Issue Primer offers an overview of the issues at hand, and how we must proceed if effective changes are to be made. You can get the facts by reading WWF's Detailed Report on how climate change is affecting our world's parks and protected areas.