"The two hottest months that mankind has ever recorded (July and August 2016) happened back-to-back. And we’re about to have back-to-back-to-back hottest years. Sea levels are also rising, storms are strengthening , carbon dioxide in the atmosphere is at its highest levels in eons, and a host of other signs show that humans are altering the climate in ways heretofore unseen."
"Using data from tree rings, ice cores and thermometers, the following chart below shows that yes, the climate has indeed changed over the past 22,000 years. Slowly. The ups and downs have been driven by changes in the earth’s orbit and other natural factors that influence the earth’s climate. The changes have been slow enough, however, for humans to adapt and even thrive during that period."
"The difference in the past century has been humans adding more greenhouse gases to the atmosphere. The subsequent temperature rise has been far more rapid than the generally gentle ups and downs over the past 22,000 years during which humans have spread out across the planet. And the temperature rise in the pipeline is even more dramatic unless we cut emissions...."
Excellent Chart: A Timeline of Earth's Average Temperature