The history of our planet includes at least five mass extinction events, the last of which decreased earth’s biodiversity by more than 75 percent and wiped out the dinosaurs. Now, biologists say, we’re on the cusp of another one. Earth is heating up, insects are disappearing and there’s a been a five-alarm decrease in speciation. There was orchestral music on the sloping deck of the Titanic. Today’s tune, lustily sung: Business as usual.