dohboi wrote:no scientific body of national or international scientists rejects the findings of human-induced effects on climate change
And none of that precludes the statement that, "absent human emissions of CO2/Methane/etc, a cyclical return to an ice age could be expected." We've been mucking the place up, not just since the 1800's; we've been mucking it up, nontrivially for a good 10,000 years. I still don't know that I buy the sun min/max as a substantial contributor to glacial/interglacial cycles; CO2, natural particulates, various feedbacks, and orbital changes seem much more substantial. But cause isn't the point.
The point is, that if we weren't screwing the place up, we'd be on a nice gentle slope towards a glacial period, which is a GOOD thing for natural, normal hominids. It could have resulted in any number of great things over a biologically significant time period; maybe even some species divergence, and another iterative step towards real intelligence and awareness.
We pooped in the atmosphere, and now its gonna slow-bake industrial civilization.
Its irritating that the denier crowds bring it up, as if it were a counter to global warming, because it allows the idea of "ice age" as something humans need saving from, to propagate. No homo species needs any saving from an "ice age"; we are an ice age set of species. It might be kinda hard on some of our current toys, but we'd make new toys, have new games, and new sports. But we'd be fine. Warming though... not fine.
Here's a reputable chart of glacial/interglacial thing. CO2s' plotted with it vary between 180'sh - 290'ish. Homo Sapiens came to exist at 250k, kinda the middle of the chart. This is the world we are evolved/made for. Varying between very cold, and extremely, hideously cold. And even in the context of that very cold.. we still have to be able to sweat liters of water a day for evaporative cooling and are essentially furless because it would interfere with heat dissipation.
That's all very recent history in geological / climatical scales. But there's a nagging problem. CO2 is not 280 today. Its 400. And rising at "Ludicrous Speed" to snatch a humor.
THAT world is very different. There aren't glacials and interglacials, there's not cold and very cold. Its just hot. Hot enough to leave vast areas of the earth completely uninhabitable by anything other than a human enclosed in a life support system suitable for deployment on Mars. Yes, I still think some humans can make a go at it in the Arctic, and maybe Antarctica depending on timing, soil creation, and marine life in the Southern ocean.... But it won't be the Earth any hominid has known.
There won't be any more ice ages. Not for millions and millions of years.
And we did it. We deleted our habitat.