Ancient evidence can also be found in tree rings, ocean sediments, coral reefs, and layers of sedimentary rocks. This ancient, or paleoclimate, evidence reveals that current warming is occurring roughly 10 times faster than the average rate of warming after an ice age. Carbon dioxide from human activities is increasing about 250 times faster than... See more

(A recent report from the anti-poverty organization Oxfam found that the wealthiest 10 percent of the global population—which includes the vast majority of people reading this op-ed—were responsible for more than 50 percent of global emissions between 1990 and 2015.)