MacDonald, Hamish
Finitude (2010)

After a thirty-year rationing plan called “The Effort” the prime minister declares VC Day: “Victory over the Climate”. But chronically depressed insurance salesman Jeremy Chutter knows it’s all hot air. The end is nigh — and he can’t wait!
Then Jeremy’s world gets turned upside-down ...
Finitude is a light-hearted climate change adventure story about an insurance salesman at the end of the world.
 
Author's website: hamishmacdonald.com