Charlie, your proposition seems to be: "We can't do anything about global warming, so let's stop wasting time and money trying."
Well, first of all, that's a false premise. There's a lot we can do, beginning with cutting the vast quantity of man-made emissions - something the planet has never had to try to cope with in its 4.5 billion years of existence until the last hundred years or so. Yes, the planet goes through, and recovers from, natural cycles. This is a totally unnatural one.
But your argument, by extension, could be carried into other fields:
"We'll never eradicate starvation among children in the third world, so let's stop wasting time and money trying to feed them."
"We'll never wipe out disease, so let's stop wasting time and money on medical research."
"We'll never stop people committing crimes, so let's stop wasting time and money on police forces, law courts and prisons."
I hope you don't actually believe any of those things. I also hope that enough people of good will and good sense will be able to act in time to ensure that there will still be a planet where people can continue to starve, get sick, and shoot their neighbours.
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