"Once the steam engine went away and we started moving into burning fossil fuels - not just burning them, but everything we do with oil - we've been experiencing [these problems] at an accelerated rate. The scary end-game scenario is getting closer and closer, about what we're going to be able to do to sustain life on this planet as we have come to know it. And I think this is a very real possibility, that we could be dealing with conditions we have no idea how to wrestle with."