That said, I'm not one of those people who believes the sky is falling, but neither am I dense enough to think we're *not* altering the environment, and not always for the better. One doesn't have to go too far from home to realize the impact we, as a species, have on our surroundings. Combine that with the findings that scientists are making, and it raises legitimate concerns, IMO.
On the other hand, you will know that things are getting somewhat better in this regard because the government is cracking down on some plants and is spending extravagant amounts of money to build waste water treatment plants for even the smallest villages (the town of 1,400 people near which I grew up got one of these about 10 years ago).
But then I moved to the city and man, what a difference! My apartment is in a building that shields me equally from weather that is 120 degrees and sunny or -30 degrees and a blizzard. If I don't go outside, I will in no way be impacted by almost hurricane force winds. I may not even know that such a storm is happening unless I turn on the TV or read the paper. In short, my world is now man-made. Nature intrudes rarely.
I think that city folk look at how they can impact their environment (i.e., almost totally) and freak out when they apply those experiences to the broader world. They believe that Nature is fragile, because it is so in their environment. But for 95% of the land area of the US, for instance, their urban existence has no meaning. For the oceans, which cover 2/3rd or 3/4 of the Earth or whatever, and are often many miles deep, human beings rarely intrude. Human beings only intrude mostly to 20 or 30 feet out of 50 miles of atmosphere.
You have to correct for proportion in many of these perceptions.
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