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As to "too late", that depends entirely on your definition. I think it's too late to stop the planet from warming throughout the rest of our lifetimes. I do not think it's too late to slow that warming down (making it easier to cope with), to prepare for it (minimizing the damage and suffering caused), and to encourage the climate system to wind down and move back to a more stable climate that's friendly to our species and those we currently live with.
It's a matter of perspective. I tend to be fairly optimistic about what we can do from where we are, but I try to be realistic about the latter. A number of feedback loops are in full swing, and we're nowhere near to being off of fossil fuels, so the warming will continue and get worse.
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