The Massive Omnibus Volume 1 by Brian Wood

In a near-future world shattered by cascading environmental catastrophes, a small group of former eco-activists sails a battered vessel across lawless seas searching for the remnants of their movement and answers about the disasters that upended civilization; along the way they confront ruthless corporations, desperate survivors, and the moral compromises of survival, forcing them to reevaluate their ideals while trying to protect vulnerable communities and discover whether hope and repair are still possible in the aftermath of ecological collapse.