Ice Age danger
Judging from the past million years of 100,000 year Ice Age cycles, we are about due for another one. If a natural catastrophe does not trigger one; global warming could, melting the Arctic Ice, increasing solar heating from the lost of reflectivity. Also, as the Gulf Stream moves north, the sea water is made more salty when it freezes. The heavier, saltier water sinks to the bottom of the ocean and circulates back to the equator. No freezing in the north, no sinking water, no circulation, no Gulf Stream, no warmth for Europe or Canada, and a new Ice Age can start. Google NADW (North Atlantic Deep Water), and NAO (North Atlantic Oscillation) for more on this.
Thanks. I’ve seen references to the theory that what triggers ice ages is the opening of the Arctic Ocean. It makes sense that a change in the climate up there from continental to maritime could bring a dramatic increase in snowfall.