Markley doesn't shy away from depicting the brutal reality of a world ravaged by climate change. From devastating floods and wildfires to mass displacement and social unrest, the novel serves as a stark warning about the very real dangers we face if we fail to address the climate crisis. This theme isn't just a backdrop but permeates every character's story, their motivations, and their struggles.

Even amidst chaos and despair, "The Deluge" offers a glimmer of hope. The novel underscores the power of collective action, showcasing how ordinary individuals from all walks of life can band together to demand change and fight for a better future. We see this through the character of Kate Morris and her ambitious project, but also in smaller acts of resistance and community building that emerge throughout the story.

Ultimately, "The Deluge" is a call to action. By weaving together the personal journeys of his characters with the larger forces shaping their world, Markley underscores the moral imperative to confront climate change and fight for the future of humanity. The novel challenges readers to consider their own roles in this fight, urging them to embrace their agency and work towards a more just and sustainable world.