In late June of 1988, just under 24 years ago, NASA’s James Hansen testified before the U.S. Congress about global warming. He noted that the Earth had been remarkably warm in the months leading up to that moment, and said he was 99 percent certain that the overall warming trend in the temperature data was due to human causes. ''It is time to stop waffling so much and say that the evidence is pretty strong that the greenhouse effect is here,” Hansen stated. (His actual testimony is here.)
Hansen’s testimony put global warming on the national agenda—and the reason for its dramatic impact isn’t hard to see. It was given during a time when Washington D.C. was suffering from sweltering heat, just as it is now; when Yellowstone National Park was ablaze due to drought-induced wildfires; and when the Atlantic Ocean would soon serve up Category 5 Hurricane Gilbert, then the most intense storm ever measured in the Atlantic basin.
In other words, events were highly conducive to climate change hitting the national agenda—and Hansen’s testimony was itself pegged to those events. Hansen even stated that the frequency of hot summers in Washington, DC had already increased enough to be noticeable to the average person.
Once again, this was 24 years ago. And I point it out because right now, we are clearly witnessing another of those agenda-setting summers—or at least, we should be.