rapture
i'm not really in to predicting when the world end. but let me give it a shot. based on science. energy usage has been increasing by about 2% per year for a very long time. so let's assume that'll continue for another thousand years or so. one can estimate the temperature of the earth by approximating it as a spherical black body. for simplicity let's ignore the greenhouse effect of the atmosphere. the earth absorbs energy from the sun. warms to some temperature. and radiates heat back out into space. we're currently a nice toasty 15C. let's predict the end of the world will happen when the temperature goes up to 100C. at which point the oceans will boil. and since humans are mostly made of water, we'll boil too. that's an increase in temperature (in kelvins) of 30%. black body energy goes up as the fourth power of temperature. to get that temperature we'd have to increase the amount of energy radiated by the earth by a factor of 2.8 or so. so when will the cumulative energy use by people exceed that of the sun on earth by 1.8? currently we're behind by a factor of 10,000 or so. but growing exponentially. in 400 years we outshine the sun. in 500 years, the oceans boil. so there's my prediction. the world will end on may 18th, 2513. at 8am.