There are absolutely connections between the point that Pollan is making and some environmental issues that we face today.
One of Pollan's major points is that we need to stop eating from the industrial food chain and instead move toward eating from the pastoral food chain. This is connected to environmental issues because the industrial food chain can be blamed for contributing to environmental issues.
In the industrial food chain, for example, synthetic fertilizers are absolutely essential. These fertilizers are typically made using fossil fuels. Therefore, making them contributes to our demand for fossil fuels, which harms the environment. The fertilizers and other chemicals also get into our streams and rivers and do things like creating a huge dead zone in the Gulf of Mexico.
The argument made in this book, then, is connected to environmental issues. Too much of our food comes from the industrial food chain, a food chain which has much more impact on the environment than the pastoral food chain would.