i guess i should have been clearer here- by 'doomed', i specifically meant that we are on track to wipe ourselves out by runaway global climate change.
i am aware of the threats of massive explosive overpopulation, nuclear winter, the possibility of an asteroid hitting us in 2017, genetically engineered plague-like micro-organisms that could decimate the population and so forth. not to mention that the sun is eventually going to 'explode' in five billion years, so we'll probably need to move offplanet by then. i do not mean to marginalise these other concerns, because they are certainly very serious threats. but the difference is, apart from the sun, that these scenerios are all
possibles-- they may or may not happen, compared to GCC which is on track to absolutely happen.
regarding runaway climate change, this is not my idea of course but that of the world's scientific body.
every science org on earth is in agreement that unless we do something quickly there will be a doomsday, and furthermore, the rate we are approaching that doomsday increases over time. a mere 3-4 decades ago it was widely estimated that humanity had 1000 years to deal with this greenhouse gas stuff. now, many of the science orgs point to 2100 or 2050 as being the dates we must change drastically by, or perish. but the problem with these latest estimates is that science orgs have a reputation to uphold and will almost always estimate on the conservative side. take the individual scientists aside who contributed to the reports, however, and most (if not all) of them tend to be more pessimistic about the dates. no scientist i've ever heard or read has said that we probably have
more time than the group estimates, unless they're in the increasingly dwindling group of those who consider GCC to be rubbish. and there is a very well-understood reason behind the pessimism which you may have heard of- the idea of "tipping points". this is probably the biggest reason why the public just doesn't understand how critical of an issue this is.
if you're not familiar with tipping points, this short animation should help:
http://www.youtube.com/watch?v=5T_3WJPYY9g#t=0m24s
in terms of what 'doomsday' will be like when we reach it, i am still trying to get a better picture. some estimate that the oceans will be completely boiled off, some that the earth will return to something approaching the proto-volcanic state in which only certain kinds of bacteria were able to survive, and some probably estimate that small pockets of humanity will be able to survive here and there. i don't know how much consensus there is on these estimates so it's difficult to show people what the earth might be like if we do nothing (or not enough) about global warming.
the reason i started this thread is because i have been really haunted by this issue the past week or so, finding difficulty knowing what to do with the rest of my life and feeling depressed that such important things i enjoy, such as wildlife, will almost certainly be dragged down when humanity goes under. i mean, plants and animals are
already being devastated by man's hand-- it will just get much, much worse.
i can't tell you how sad that makes me, because all my life i've thought that, even if humanity wiped itself out (ex: nuclear winter), other animals would find a way to go on and some of them would quite possibly inherit our standing as 'ultra-intelligent' creatures. that was always a very cheery thought whenever i was pessimistic about humanity. but now things have changed a lot... how can i take the human race even remotely seriously when it's probably going to crash and burn in our lifetimes by our own hands, likely wiping out its successors as well? so my latest productive thought was to think of myself as an explorer in time, able to witness first-hand the splendor and positive accomplishments of civilisation before it's gone... before there are only fragments left that may or may not be discovered by future lifeforms or aliens one day.