For some reason humanity is obsessed with how the world is going fuck itself over. Global Warming, Mutually Assured Destruction. Hell, Religions all over have been prediting the end of days for centuries. From what I can tell this is a by-product of the time before the Renaisance. I'm going to blather on for a while now, I hope you keep up.
See before the Renaissance people didn't understand the idea of humanity improving. Nowadays we take it for granted but back then people were sure that things were just getting shittier and shittier until eventually the Apocalypse would come along and end everyone's troubles. The reasons for this view's popularity is obvious, if a ruler or a church, (meaning any religious institution,) could keep the masses complacent when things were bad by effectively blaming everything on a divine plan that demanded that things get bad then you don't have the risk of revolt. This theory was so widely accepted that we got the Dark Ages, a time where humanity's improvement culturally and technologically just sort of stopped due to a consensus of "why bother, we're all fucked anyway".
Now the Renaissance was essentially the end of this view's popularity. People realised, "Hey, we're not doomed - things are actually better than ever! Holy shit look at the neat crap we can do in art, archetecture, literature, technology! Holy crap we're awesome!" Finally the world wasn't just going to Hell, (literally.) The result was the birth of the modern world.
BUT.
This long-held view of global anihillation never ceased to exist it just declined in popularity. For various reasons now, (not just religious ones,) humanity seems fixated by the idea that somehow, somday, we're all going to be fucked, (global orgy at the end of the world anyone?) Lately the popular theory is Global Warming, a secondary theory is that the Mayans knew something we don't and managed to pinpoint the destruction of Earth down to a 24 hour window. I'm not saying that feeling shitty about the state of things isn't warranted, there are wars, corruption, poverty, resource concerns, a global market that can seem to be teetering on a knife edge, crazies in various parts of the world willing to blow themselves up just so they can kill innocent people, corporations using questionable methods to ensure gargantuan profits, pollution is believed to be causing wild weather conditions...
But while its so easy to concentrate on this stuff it should be also noted that despite all of this in the 20th Century mankind increased its average lifespan by 20 years. We've discovered successful ways of combatting cancer and AIDs as well as a multitude of other diseases, on average our standards of living have improved. We have technology now that people just 20 years ago couldn't have even dreamed of. Travelling to other planets has become a question of money and risk rather than possibility. It's not a bad time to be alive. As a species and civilisation we are, as the Renaissance man would have put it, pretty fucking awesome.
The real concerns are things like the popularity of Twilight and Justin Bieber.