Clear and unequivocal: Thousands of scientists sign letter on climate crisis

An open letter signed by thousands of scientists from around the world may be the clearest demonstration yet of their near-unanimous agreement over the globe's emerging climate crisis. Published Tuesday in the journal BioScience, the letter includes 11,258 signatures from 153 countries -- including 409 from Canada. "We declare ... clearly and unequivocally that planet Earth is facing a climate emergency," says the letter's opening statement. It's another example of a growing willingness by scien