You may have watched the video to your right. If you haven't, it's Barack Obama's recent address on his commitment to fighting global climate change. Other than the 'clean' coal business, it sounds very reassuring if you spend a lot of time worrying about the environment.
Still, when I say, "the environment," I do remember the areas and issue sets I used to think about when someone else said that: waste from heavy industry, urban air quality, water pollution (via manufacturing, chemical dumping and road runoff in urban areas), bad logging practices, and wilderness reserves. But the environment includes the whole planet, including that half of the land mass (give or take) devoted to food and fiber production for human uses. Agriculture is the largest source of what's called non-point water pollution, basically runoff from large areas, and the primary cause of the enormous ocean dead zones at the mouths of our rivers. It's a major factor in soil erosion, and depending on who you ask, may be responsible for nearly 40 percent of greenhouse gas emissions.
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