Volcanoes are a new climate concern, apparently. As ice in the Arctic has been melting, it has been setting up some global tectonic shifts, - very small, but still measurable. The redistribution of water weight changes the
isostasy of the Earth's continental blocks as it presses down harder on the ocean basins and lightens continental crust in Greenland, North America and Siberia. Isostasy is not often talked about with regard to the tektonic movements of the Earth's crust, but in geological history has been theorized long ago and examples have shown up more recently, like the shifting of the crust at Lake Erie in North America. The
wiki is worth a read.
Volcanoes have been going active globally at an increased rate, most notably, Las Palmas, Kiluwea and an area between Madagascar and the African continent where recently, a
huge new underwater volcano has earned the honor of being so enormous to rate being called one of the largest underwater volcanoes in the world. This volcano owes its existence to the draining of lava from below the "
Mojo", a discontinuity lying at the boundary of the Earth's thin top crust (lithospere) and the deeper magmatic interior of the Earth (Asthenosphere).
Of note, the super volcano Krakatau has just been found to have gone active.
I admit, I'm a geology nut. I love this sort of thing and find it thrilling to see so much activity going on, all of a sudden.