Actually, just a couple of seconds, if that, when Christ returns and the world is consumed in fire. If you do some further research, you'll find that the planet goes through roughly 150 year cycles of warming and cooling. Back in the 70s folks feared an upcoming Ice Age...guess they missed that! You might get into vulcanology to learn how volcanic eruptions make a drastic change in weather world wide...for instance, in 1815 Mt. Timora erupted creating the year without a summer in 1816; which caused Mary Shelley to write "Frankenstein." Enjoy your day!!