I love how the anti-American bigots trot this sort of bullshit out, without context.
The US had a sterling record compared with any other nation that's gone through an industrial revolution. What's more, the industrial revolution happened well before we had any concept of the long term consequences to the destruction. The Chinese are well aware of global warming and the rest, they've chosen to engage in dangerous policies because they view it to be better than enforcing their own regulations.
As far as the lakes and rivers go, again, nobody realized the consequences when things were being built. But, now that we do know better, the water is being cleaned and for the most part is clean.
As for the currency manipulation, you wouldn't be saying that if you knew what was going on. The Chinese government still owns most of the enterprises in China. They withhold pay that should be going to the workers in order to lend money to American businesses and the government. The net effect of that is that you've got a lot of people working for very little and the normal adjustment to the currency value doesn't happen because they're sending cash back to counter act that.
In the long term that's extremely dangerous as at some point they won't be able to afford to keep lending money, at which point the wages will need to rise and when that happens they won't be able to export as many goods. It's going to get extremely nasty if they don't manage it right. Or they'll wind up with prolonged stagnation as things catch up.