I’m an optimist by nature, but the more time that passes without doing anything enormously large to solve this problem, the more concerned I get. The further down the path we go, the more effort that’s required.
Katharine Hayhoe
Based on the evidence, about 97% of climate experts have concluded that human-caused climate change is happening. What We Know helps us understand the science behind the realities, risks and response to the climate challenge.
Read the Backgrounder » I’m an optimist by nature, but the more time that passes without doing anything enormously large to solve this problem, the more concerned I get. The further down the path we go, the more effort that’s required.