The Earth in doomed in Insomniacs, but how it's doomed is up to you and your group. The Kurzgesagt youtube channel continues to be an invaluable source of information on existential threats, mass extinctions, and productive nihilism. Here are a few choice options that either made it into Insomniacs more or less directly, or were inspirations for some of the doomsday scenarios or exoplanets.
Here's some stuff what's been making life in the plague regime bearable. Some of it's old, some of it's new.