Al Gore accepted his 2007 Nobel Peace Prize by telling the world in straight-forward language: "Climate change is a real, rising, imminent and universal threat to the future of the Earth. "
Quoting the new York Times in repeating Al Gore statement that :

“our world is spinning out of kilter” and that “the very web of life on which we depend is being ripped and frayed,” Mr. Gore warned that “we, the human species, are confronting a planetary emergency — a threat to the survival of our civilization that is gathering ominous and destructive potential even as we gather here.” But, he added, “there is hopeful news as well: we have the ability to solve this crisis and avoid the worst — not all — of its consequences, if we act boldly, decisively and quickly.”