The State Our Earth is in
Our earth is not in the best state it could be in. People are always throwing their trash just anywhere. The garbage men don't pick up the little pieces of trash they drop. At the parks, almost no one cleans up after their dog. I'm not green or any of that weird stuff, but this is just wrong. It's like people don't care anymore. Believe it or not, I really don't think they do. There are trash cans everywhere! There's even bags to clean up after your dog at the park if you don't have any! There's absolutely no reason for people to destroy our earth. They're just self centered. They don't care. But there is one thing we can do. We can clean up after our dogs. We can throw things away in the trash can. We can help clean up the earth! 
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Other cultures aren't slobs
In other parts of the world, people aren't so disgusting. I think it's in Singapore where it's actually illegal to either chew gum or spit it on the ground. From what I hear, their city is very, very clean. And in Beijing, I think I heard on the news that they are outlawing spitting just in time for the Olympic Games.
I know that doesn't really affect us here, but it's just another point of view.
Vienna is clean
I can't speak for all that many European cities, but Vienna in the 80s and early 90s was a very clean city. You didn't notice its absence unless you thought about it, but it's true. We expect to see trash in an urban city, but not over there. I guess it is part of their culture.
(Now, the air in Europe, that's another story.)
Some may not remember that America used to be a lot dirtier than it is today. Back in the seventies, seeing litter along the highway -- I mean, a lot of it, everywhere -- was quite common. People would finish their McDonald's stuff and then just chuck the trash out the window. Anybody recall the ad campaign with the indian (oops, "native American") in full tribal regalia who wandered around looking at the litter and then turned to the camera to reveal a single tear rolling down his cheek? That campaign had an impact. Our culture is much "cleaner" (in that sense) than it used to be, though we may perhaps have backslidden a bit.


Natural consequences
I think "destroy" is too strong of a word in this context. I don't believe man has the power to destroy the earth. On the other hand, I agree with Juliana that too many people are just disgusting slobs, and their feces--metaphorical and literal--is messing up what could otherwise be a decent place. This kind of poor stewardship naturally falls out of a culture that has rejected their heavenly Master, despite its stupid worship of "Gaea".