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Climate change is happening, humans are causing it, and I think this is perhaps the most serious environmental issue facing us.

The most important environmental issue is one that is rarely mentioned, and that is the lack of a conservation ethic in our culture.

The environmental crisis arises from a fundamental fault: our systems of production - in industry, agriculture, energy and transportation - essential as they are, make people sick and die.

Address these environmental issues and you will address every issue known to man. And we keep dabbling in things that aren't really that important in the long term.

The pollution problem is always seen as someone who was doing something bad that has to be stopped. To me, pollution is doing something bad and good. People don't pollute because they like polluting. They do it because it's a cheaper way of producing something else.

Food and the way we grow it and produce it are a major cause of environmental degradation.

Human activity is having a major impact on the planet. We consume or have diverted a large proportion of the productivity of the land and oceans. Our hunger for land crowds out fellow species. Our waste products pollute the waters, warm the atmosphere and acidify the oceans.

Sadly, in the name of progress, we have polluted the air, water, soil and the food we eat.

Practically every environmental problem we have can be traced to our addiction to fossil fuels, primarily oil.