not even close. We've only been organized and civilized for like 5000 years(in celestial terms, not ****), and we're already just about ready to wipe out the human race. There's no chance we'll see the next million, let alone 5 or so billion.
There are so many things already happening that WILL kill us all, given enough time, and given that something else doesn't get to us first. Neuclears, nanomachine research and general genetic weakening just to name a few.
There is hope though, if we learn to effectively colonize celestial bodies (planets, asteroids etc), we can spread the human race out enough that any one thing would have a tough time killing us all. That said, I have a hard time seeing earth being able to support human life for more than a couple thousand more years.
I haven't read all the posts before me, but I'm certain that someone has claimed humans are on the brink of destroying life on earth. There's not a snowball's chance in hell, thats just arrogant. Earth will continue to support life until something very powerful from outside the planet changes the entire dynamic of the planet. Humans can and will kill all humans, but not all life.
edit: just finished reading all the posts, most of them were what i expected except for two. Bluezaft, your post was brilliant, It's something that I must say hadn't crossed my mind, but after you pointed it out to me (err, us) I've got no doubt in my mind that you're right. But I really doubt we make it to the point where we can evolve to the point of being another species.
Also, zerobeat. no ****? I hadn't looked into andromeda either, thats really pretty badass. I knew galaxies collided and such, but I didn't know we were next. And yeah, supermassive blackhole interaction pretty much spells doom for us. Like you implied, there's no real danger of running into another planet or anything goofy like that, space is far far too big, and galaxies far far too sparse for that to happen.
What I really wanted to address was global warming. I agree with you that it has a ticking timebomb attached to it, that, if given time to tick to its end, WILL kill us all. However, the way I see things global warming needs to take a ticket and find its place in line. For instance, purell (well, not the actual product, but the basic mindset of people that use them). Hand sanitizer is honest to god doomsday. If and when we immunize influenza, or any of the plethora of fantastic diseases that get 99.99% killed by "antibacterial!" products, it will kill us all. Why in the world would you want to accelerate bacteria's ability to kill us so god****ed much? for instance, there are already at least 4 types of Tuberculosis that are completely immune or otherwise resistant to all known antibiotics.
@ the dude bashing moonflight. The way I see it, like I said before, space exploration is our only viable option for species survival. Staying on earth = impending and unavoidable doom. But unless einstein is wrong, we're pretty much boned.
edit2: Zero, I think you're a bit too cynical about mars terraforming. Moving enough stuff from earth to mars to change the planet is impossible of course. Mars is much too far away for earth to provide any support of that type. But I don't think that 100 years, for at least partial terraform, is all that far fetched. Granted, that is assuming we can find an energy source easily attainable on mars (and I guess that is quite a big assumption) but I think that will happen. The key to this, IMO is that there are a few plants on earth that could probably survive the martian climate. Lichens and mosses could certainly, given time, make it possible to plant more and more complex fauna. It would require a massive financial undertaking to start, but I think if you can get a few hundred people, and some basic machinery to mars, human ingenuity can find a way. Everything we need is on mars, if only we can get a foothold. But at the end of the day, it probably won't make much difference.