This is not a coincidence, the Earth has had an exponential increase in temperature and its been doing so for the past century. I believe that once mankind became more technologically advanced, with the burning of fossil fuels, releasing CO2, and other harmful substances, the heat began to rise.
Sure it's a slow process, but the process is being done nonetheless. We can't be so selfish today and think, "Oh well future us can handle this situation easily." But, "future us" may not be capable quite yet or when the technology to fix the problem is available it could be too late. We need to stop this now before it becomes a problem in the future.