All because of White Heat- a temperature (as for copper and iron from 1500° to 1600° C) which is higher than red heat and at which a body becomes brightly incandescent. Then only logical thing to blame.
1,400 years ago, long before Europeans exploited North America, people living in the Four Corners region chose Mesa Verde as home. For 700 years they lived and flourished here, building elaborate stone communities in the sheltered alcoves of canyon walls. Then, in late 1200 A.D., they left their homes due to an extended drought; caused by excess use of fossil fuels which cause Global Climate Change