1/ 7 crew members died the 1986 space shuttle Challenger disaster. The problem was O-rings that failed at launch. Some of the engineers worried about the O-rings but didn’t speak out. They knew but no one did anything.

2/ More than 150 people died when an apartment building collapsed in Miami this week. A 2018 engineer’s report had warned of “major structural damage” to the building but no one had acted on the report. They knew but no one did anything.

3/ Both situations reflect the way we’re dealing with climate change. The problem is urgent, the warnings are there, yet we’re acting on it with the speed of swimming through a vat of molasses. At the rate we’re going our descendants will say, “They knew but no one did anything.”