What happened in the second half of the 20th century-won't happen again for over 4,000 years?
550068
I'm guessing ... a comet? Hale-Bopp or Halley's.\n\nguessing again .... sun and planets in a straight line?  or maybe Conjunction of four of the planets?\n\nCan I phone a friend? Ask the Audience? \n\nTry Google or Wikipedia with these: 'comet' or 'conjunction'.\n\n4th grade! Sheesh ... that's more like the $500,000 question on Who Wants To Be a Millionaire.  Even then, you get to choose one out of 4.
1121163
Well take a look at what's still left of ancient cultures. It all depends on the building materials. I think 20,000-50,000 years would be enough time for things to be knocked down and destroyed but it's all really in how the structure is preserved.
993504
War, famine, pestilence, death.  Not in 1000 years, not in 100.  Probably only 20 or so.  Oil, bucko, is the fuel of this civilization, and clean water is getting short as well.  When the power goes off and stays off, water doesn't get pumped.  Do you know the location of the nearest natural source of potable water?  Without water, toilets don't flush, and the cities will be dying of typhoid in just a week.\n\nThose neighbors of yours?  Many parts are edible.
1144529
Remember todays date and after a couple of decades u will say again..what happened to the good old days?? It always happens
634522
Climate change is a natural cycle for the Earth and will happen regardless of human interferance. In fact if you look at the cycles of Glaciation and Warming over the past few hundred millenia, we are probably due for a massive cooling phase, maybe even dramatic glaciation, sometime in the next few hundred years. A number of things affect this, most notably the tilt of the Earth in relation to the sun. This is effected by the cycle of the planets and their orbits, and cannot be changed or prevented. We are due, and when it happens it is likely that large portions of the northern hemisphere will become covered in glacial ice, as happened about 20,000 years ago, and lasted until about 8,000 years ago. The mini-glaciations happen in about 10,000 year cycles, so our current warm period (an inter-glaciation, not a warm period) is due to end soon. \nOne of my archaeology professors said to me once that it may well be deemed that the breif delay in this caused by carbon emissions may be deemed the greatest attempted effort of human engineering well in the future.
937907
Approximately 5,000,000,000 years
304636
Not in the near future. It could happen some day though.
1117121
In the past 2000 years, we actually have went backwards...
80400
I don't believe that there ever was some golden age on the earth, except in the mind of some mythologist or visionary. Based on that, i would say the same era i was born in, the latter half of the 20th century, the nuclear era, the modern/postmodern era.
158822
i think in less than 100 years..
610011
5,000,000,000 years, more or less
1056496
No one really knows that answer except God. The signs are in the Bible. There are no specific dates, just things to be aware of. I personally dont see it happening in the next 100 years. But thats my opionion.
243420
Thus the problem we face currently.\nNo one knows.\nGeology is problematic because it does not accurately date the world beyond aproximately 20,000-50,000 years (even THIS is questionable).\n\nAt the rate the sun is shrinking, it must be younger than 4 billion years (the evolutionary time scale place's the earth's date a 4.6 billion).\n\nThe movement of Niagra falls places the Earth's date a hundreds of years but no later.\n\nThe amount of top soil on earth places its age at hundreds of thousands.\n\nThe moon's pattern in relation to the earth places the earth's date a millions of years while the dust collected on the moon's surface places the earth in the upwards of thousands of years.
785305
I don't think it'll ever be fully reconciled, but it will be closer than it is now.  It seems the pendulum of thought is swinging back toward the dark ages at the moment :(
367040
When Plato's ancestor Solon went to Sais in Egypt (600 BC), the priests told him about Atlantis. They also said that inscriptions on their temple walls told how many times civilisations had risen to great heights and then fallen because of natural catastrophes such as floods, fire, earthquakes, etc. I think that maybe we are being a little presumptuous to think that it can't happen to us. I have spent the last 15/20 years researching a related subject and in my opinion the last great catastrophe was 9600 BC, with the sudden and abrupt end of the mini-ice-age called the Younger Dryas period. I believe that this is the basis of the Biblical flood. Getting back to today - the Christian versus Muslim thing - yep, of course it coming, you can smell it! I should imagine that most of the faceless men in grey suits already know this and are moving their pieces on the world chess board accordingly. Humans are amazing - we've been on the moon and sent machines out to beyond the solar system, I can pick up my phone and talk immediately to a person on the other side of the world, I can sit in my armchair and with the smallest of thumb movements be entertained by 100 different TV channels - but with the flick of an eyelid this civilisation can be destroyed because people believe that their unseen and unproven overlord of the cosmos is better than the other man's invisible and all-seeing ever-present boss. It almost makes you want to scream! We're such clever animals - but I don't think that we're too intelligent - and when it's all over we'll begin again.
1099842
well its not a very long span of time so there will be very very minute changes.. if we remain alive, then i think some of the changes can be:\n1) average height will reduce\n2) we will develop some adaptations in our skin, lungs and eyes to protect ourselves from pollution\nand many other possible changes...\nwe must not say that we wont be alive after 20000 years.... always hope for the best........\nLETS MAKE THIS WORLD A BETTER PLACE TO LIVE
409166
have a look here\nhttp://stevegilliard.blogspot.com/2005/05/20-years-too-long.html