Extremely well put.
It would be lovely wouldn't it if humans could pump out as much greenhouse gases as they choose with impunity. That in some way, out fragile ecosystem could somehow dispose of it discreetly without it having any effect on the air we breathe or the oceans we use as a rubbish bin.
Or wouldn't it be convenient if the global scientific community suddenly told us that for decades they have been totally wrong. And that we could stop worrying about man made climate change.
But as any right minded person knows, it is us humans who by our profligate nature are trashing our home.
And that has to stop.
I guess that, at heart, the issue here is the usual geological one: the earth has gone through lots of different global temperature situations, why worry about this one?
But then no-one said we're destroying the earth. (Or who did wasn't right.) Cause we're not. Whatever we do, the earth will go on. Even full nuclear destruction wouldn't destroy the actual planet as such, some life would survive (and a lot in the oceans), and eventually radiation levels would subside and proper regeneration of life would commence.
Instead, the issue is that current global warming will be extremely damaging to human life as we've developed it. Significant portions of habitable areas and agricultural lands will be drowned or rendered useless (again, to us), which will come at enormous cost of hardship, lives, and money, and set in motion strife (wars) that will cause more of that. (And for those who care, it will also significantly alter nature and ecosystems, and will make many species go extinct. But I'm focusing on the human angle here.)
That's why global warming is an enormous issue. Not because we're damaging the planet in a way that's never happened in geological history.