Protecting the environment isn't a "liberal" idea; it's everybody's business. Liberal or conservative, Democrat or Republican, the environment provides life support for us all, and if we fail to recognize that, we are truly doomed as a civilization.
To help explain this, I've put together a simple thought experiment. It begins with three undeniable truths about humans and the environment:
This should be self-evidence, but some people still don't get it. The Earth's resources -- oil, forests, water, energy, and so on -- are finite. They do not exist in infinite quantities. If they did, they would obviously be larger than the Earth itself (and would, in fact, fill the universe). But they don't fill the universe. They are contained within the boundaries of planet Earth, and therefore they are limited.
Of course, many of Earth's resources can be either regenerated or recycled, but that only happens over time -- usually a long time. In the case of oil, it's hundreds of thousands of years. For fossil water it's much the same. The rate at which modern human civilization is using up these resources is orders of magnitude faster than the rate at which they can be naturally regenerated. This holds true for oil, water, topsoil, forests and more.
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