Climate change was one of those concerns. “Global warming” was a phrase just starting to be heard, in large part due to the June 23, 1988 testimony of NASA scientist James Hansen before the Senate Committee on Energy and Natural Resources in which he explained how and why the Earth was heating up. Hansen, of course, quit his job at NASA just a few weeks ago to allow himself more free time to remind people that the risks he warned about more than two decades ago are still very relevant.