The heat wave wreaking havoc on Western Europe signals the arrival of a new era: extreme heat events that would have been virtually impossible without human-caused global warming are now a deadly reality.
Why it matters: The fact that we've arrived at this point — with deadly extreme heat virtually shutting down major industrialized nations, but without changing course to curb greenhouse gas emissions — is depressing and baffling to the scientists who have been warning about this moment for years.
