It’s heating up in Antarctica and flooding in the driest place on Earth – Chile’s Atacama Desert. Carbon dioxide levels in the atmosphere are higher now than they’ve been in the last 23 million years.
From what can be gleaned from air bubbles trapped in ancient ice, C02 levels have averaged between 170-280 parts per million since our species first emerged on Earth approximately 200,000 years ago. Now, however, they’re reached 400 ppm. At the rate we’re going, C02 concentrations could well reach 550 ppm by 2100. We are all canaries in this coalmine.