There just isn't a good word for "immediate and drastic action is needed to slow or hopefully reverse the catalysts of what will already be severe, society coll

There just isn't a good word for "immediate and drastic action is needed to slow or hopefully reverse the catalysts of what will already be severe, society collapsing series of events over many decades." We don't live long enough for our brains to fully appreciate a crisis which evolves so slowly, even if we trust the people who are doing research on it.