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That's why it's called an ecosystem ... one can't talk about dumping pollution into a river without talking about that river flowing to the ocean and about how that affects the water vapor produced by evaporation along the way and about how the remaining cruddy water is then merged with the ocean's brine and then about how that water corrupts the evaporation process of the ocean itself and then about how the pollutants that become part of the vapor are then injected into the atmosphere which then reacts by ... yaddayaddayadda.
There is no insignificant part of the 'system'. If any claims are made that "human pollutants aren't hurting the atmosphere", that's not very astute. Literally everything that enters our environment has some sort of impact on all parts of it. Let's not wait until we reach an irreversible critical mass before we recognize that human waste is definitely affecting our planet's ability to keep itself clean enough so we can continue to live here. We don't know or care about how to deal with it, now, so there is no hope that we will be able to reverse its effects once it gets past the tipping point.
It's true that the planet doesn't give a crap about us ... it's just as happy to consist of volcanoes and a methane atmosphere. WE should be concerned enough to maintain an environment that will sustain US. We simply can't go around dumping and polluting at will forever ... sooner or later it will catch up with us.
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