Wow, it really does amaze me the level of human arrogance in these posts. You all attack the "So?" commenter as doom and gloom... but in reality, you are all a bunch of idealizing, anthropomorphizing hypocrites.
Wake up people, the Earth has been around about 99% longer than we have been on it. There have been mass extinctions before, and there will be more. For those that like to argue "it's different this time, because we caused it!", you truly don't understand how natural selection works.
Newsflash: we are a part of the natural selection process, and have been since we started walking on two legs. You act as if somehow humanity is separate from the rest of nature -- as if when "nature" (in other words everything that ISN'T humanity) causes extinction, it's no problem (that's just "nature" or "natural") ... but humanity, oh hell if we are the causes then all hell breaks loose.
Please. Get over your own arrogance about your place in the world. Just because humanity causes extinction doesn't make it any less natural then if it was because some population of T-Rex's did it millions of years ago.
"Nature" (as this concept of something external to humanity), doesn't exist. Period. There's no "right" or "wrong" involved with extinction events unless there is a deliberate moral choice. Just as there is no "right" or "wrong" involved when people die, unless there is a deliberate, moral choice.
Yes, in fact, the motives do matter. Life, nature, and everything around us that we are a part of, is nothing if not a series of unintended consequences. A butterfly flapping it's wings and all that. Should we stop everything we are doing because we aren't sure what the consequences are?
Stop driving, you're killing fish in a stream. Stop paving roads, you're edging out the habitats of countless species. Stop using electricity, you're damaging the environment in the way it's produced (even solar and wind power require land to be abused). Stop using the internet, as we're killing species of coral by laying massive fiber cables along the ocean floor.
There is no way to avoid any of this, unless you stop progress entirely, which would in the end take a human extinction event. If you are reading this, if you are posting here, then you are just as involved in extinction events as anyone on the Yangtze. Typical that a bunch of people in the "enlightened" west would bash on a bunch of people in the East for something like this. Arrogance, plain and simple.
Grow up, stop whining, and realize you're all just as responsible for this kind of thing, and that's just how nature works.