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At least the original explained it better: The aliens were in the process of changing the atmosphere of Earth by growing plants to produce the right gases.
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Indeed. They didn't even try to explain the whole "let's watch the aliens spray bloody stuff that turns into plants everywhere" thing. That was kinda disappointing, but I still enjoyed the movie despite some leaps of logic and plot holes here and there.
*****Minor Spoilers******
Oh, and I disagree! You fool!

If the aliens hadn't all caught colds and died like little bitches, then they would have exterminated the human race no problem. I mean, can you think of any way the humans could have stopped the aliens? And no, that cheap shot that Tom did with the grenades doesn't count!
It doesn't count, I say!