It's not your fault, not directly.
The western world had its industrial revolution more than a hundred years ago. It polluted its own rivers, its own cities, and had adults and children alike working in terrible conditions. Slowly but surely, its population realized this was not sustainable, that the costs were too great, and instigated changes such as environmental controls, laws on working conditions, etc. Businesses and factories had to adapt to the changing conditions and the lack of close-to-slave labour, but the price was worth paying.
Fast-forward to the future, and with the advent of new technologies and speedier communication methods and transports, we live in a globalized world. It is now possible to manufacture goods in another country than yours at a lower cost. These countries have just started their industrial revolution, do not know better or are dealing with a very accelerated developmental process and its growing pains, while usually having the short end of the stick due to an imbalance in power in global politics. Capitalists everywhere jump at the opportunity to maximize their profits, but at the same time, they also offer cheaper goods to their customers. Everyone wins.
Everyone wins? No, everyone wins here, in the western world. You and I enjoy products (of varying quality, I must admit) that are cheaper than if they were produced here. Consumers rejoice, and send a clear message: keep it coming, that's what we want. We are happy to maintain a high quality of life, in a a safe and healthy environment. Someone, somewhere though is paying the price, and that is the workers in south-east Asia or elsewhere, who die in their cancer villages. Is it your fault, my fault, our fault? Not directly. I sure as hell don't control environmental politics in China. I also am not responsible for managing the development of a country of a billion people. I do however have the choice of buying products that were made by companies respectful of the environment and its employees. Slashdot likes to decry the conditions of the Foxconn workers, and the western world pointing fingers at it and sending that message to Apple makes them care just a tad bit more, but somehow when the environment is concerned, it's their own goddamn problem? A lot of the pollution problems in developing countries is incurred because they are developing, because of _us_ caring only about a cheaper price and results and not one iota about their conditions. We're not willing to pay for them to have environmental regulations.
The Chinese industrial revolution is barely 30 years old, and they haven't yet learned to stand up for themselves. They're starting though, slowly. Give them time, give them the hundred years the western world had. We'll see then. Meanwhile, enjoy your cheap stuff and keep blaming them for the world's environmental problems.
PS: This post is not against _you_ in particular. I'm just trying to argue that fault is not very clear-cut, but I do think that part of it is ours.