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Many of these global warming issues would not be such a problem if there weren't so many humans on the planet--billions of humans eating and growing WHATEVER they eat, using fossil fuels, cutting down forests for all kinds of purposes, etc., etc. Back when the global population was a fraction of what it is now, none of our activities or choices had the impact they have now. Of course, technology is a huge factor as well, but this is amplified by our astonishing reproductive success. We all feel entitled to procreate, but at this juncture in the planet's history, refraining from begetting is something to consider as well as vegetarianism. If we're really serious about addressing the problem, that is.