Not the good environment, but the farm environment, or maybe your neighborhood if everybody has been using herbicides.

There is an association between areas of the United States where atrazine is heavily used and the prevalence of obesity.

So? Read this straight forward explanation of how herbicide interact with your body and cause your pancreas gland to malfunction.

Here's another article along the same vein. As this notes, correlation is not causation. This is science speak that can mean a couple of things. One, it can mean that there are so many variables that to knock them out of the picture would require more money and time than the scientists will ever get in their lifetime.

Two, the correlation is actually a catalyst, causing events to happen in a sequence that results in disease. Herbicides (and other cides mind you) have profound biological and physiological impacts on the body. With so many chemicals out there there's no way a scientist or researcher could come right out and say "this is making us fat and sick." S/he wouldn't be able to prove it.

But s/he could show that there is a strong correlation. In other words, stay the heck away from using chemicals on your yarden. That's easy, but how do I convince my neighbors to not use it? They don't realize that they're poisoning their bodies and mine, too, in the name of having a green lawn. They don't realize that when it rains, the chemicals they use runs off right into our water supplies.

Maybe next time it rains I'll take a cup and scoop up some water from the street and offer it to them to make my point. The worst part: one's skin absorbs these chemicals via contact. Stay Off The Grass indeed!