Ethan Siegel in Forbes:
CO2 concentrations now sit at 412 ppm, Earth’s temperature is a full 1.3 °C (2.3 °F) above pre-industrial levels, and still, no meaningful, sustained initiatives to reduce our global carbon emissions have been taken. In fact, they’re presently at an all-time high. The longer we delay meaningful climate action, the more severe the consequences will get not just for all of humanity today, but for generations and even millennia to come. Although our climate future intimately depends on how global emissions unfold in the coming years and decades, the latest IPCC report provides unprecedented clarity on a number of important issues. Here are the top six takeaways we should all accept and understand.