>1. If it were true, I expect it would be a national security concern, and quickly remedied

You live on Earth correct :) just joking.

Just look at what has been done for Climate Change, we knew for 50, probably 70 years what fossil fuels are doing to Earth. Plus a good estimate was know when Climate Change would affect the Earth. Here we are heading to +3.5C, probably 4C.

Since when a Carrington type event will happen is unknown, do you really think we would prepare for it ? That would cost real money, maybe taking wealth from the super rich.