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Relatively speaking, we are all ignorant. Human history comprises only a small fraction of the Earth's history, and our meteorological data comprises only a small fraction of human history. Based on what we do know about the geological history of the Earth, it is quite possible Earth maintained much warmer average temperatures throughout most of its history than what we're currently experiencing. In fact, some fossil evidence points to the fact that, for most of Earth's history, the poles weren't even frozen.
Sensationalism is sensationalism, regardless of the source. Are we putting pollutants into the air? Yes. Is that bad? Yes. Is it the sole cause of "global warming"? Truthfully, nobody knows.
The sad fact is, most people are too apathetic to care either way, and all of this talk about global warming and pollutants in the air falls on deaf ears. The energy spent (wasted) talking about the subject could be better spent on programs that actually help to provide a solution. Don't tell people to install solar panels on their homes; make it in their best interests to do so by investing in solar companies and providing cheaper alternatives. Let the free market do what it does, and when the masses of sheeple realize that they can't just "plug in" or "pump" their way to cheap energy, they'll catch on. No need to proselytize.
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