Definition of "seething"

But as the nation’s most populous state stares down a seething climate crisis, one that cranked temperatures into triple digits last fall and set off a series of infernos that exploded, into bone dry air, the rebuilding process is beginning to look different.

2021 January 15, Debra Kamin, “Hounded by Wildfires, Californians Rethink Their Willingness to Rebuild”, in The New York Times‎