Every generation, stretching back to the begining of human civilization, has had it's members who believe the world is coming to an end, that the apocalypse/second coming/gehenna/ragnarok/oblivion/acension whatever you want to call it, is just around the corner. These people are pretty much always wrong, and will continue to be. Don't ruin your lives over worrying about things that you have no control over anyway. Yes, we need to fix our mistakes and problems, the world is not in the greatest shape, and it is humanity's responsibility, ALL OF US, to do what we can to make it better. Global warming, AIDS, poverty, starvation, war, these are all things that at first, seem impossible to solve, but when you realise how far humanity has come since we first came together to create societies, you realise there is nothing we can't do if we fully commit our minds, willpower and endurance to it.

The world is always going through ups and downs, usually at the same time, but don't get bogged down with worrying about things. Stand up, contribute to causes you believe in, work to make things better, and live your life. We'll (and I mean humanity) still be here in 20 years.