The thing we should be more worried about is a possibility of a major eruption from one of the big volcanoes around the world. When Tambora and Krakatoa erupted in 1815 and 1883 respectively, the effect on Earth’s climate was huge for nearly a decade; and there are plenty of volcanoes in the Indonesian Archipelago that are capable of truly massive eruptions ejecting eight or more cubic miles of volcanic ash.
That would put the kibosh of GLOWBULL WARMING!.....................
One word.....Yosemite.
Why worry? It achieves nothing but heartache. We're overdue for an earthquake in Cascadia near Seattle. Same goes for the Hayward fault through Oakland. Then there's Yellowstone volcano to worry about. The New Madrid earthquake zone near the Mississippi River could wreak havoc. Mt. Lassen volcano in the Cascade Range could erupt. Like I said, why worry. One of these things is bound to happen sometime, and if it does, then worry about it.