While an interesting read, where is the data? You even look at the sources on the wikipedia page and it says [citation needed].<p>Cancer isn't evenly distributed across the countries (i.e. every city of 1M has 100 colon cancer cases), and clustering would be expected even from random distribution. Then layer on top things like genetic makeup of the population, smoking rates, diet, etc, etc, etc and you end up in a situation where confounding factors can make it <i>really hard</i> to tease out causes, especially if the effect is small in size.<p>I'm not saying there aren't higher rates of cancer in this area or that industrial pollution can't contribute to cancer rates, but this wikipedia article seems like nothing but a bunch of talk.