Mars Evacuees takes place in the wake of a more conventional fix-it SF novel gone wrong. An alien species, the Morrors, has moved into our mostly uninhabited, unneeded polar regions and reversed global warming! So far, so environmentally-conscious can’t-we-all-just-get-along Pertwee-era Doctor Who story. But oh no, the aliens turn out to want way more space than they said, and to be able to reverse global warming too effectively, creating a creeping ice-age! It’s every gumtree/craigslist roommate drama ever, on a global scale.