Scorched Earth is a 2018 Canadian-American post-apocalyptic science fiction/action film directed by Peter Howitt starring Gina Carano.
The combination of pollution and relentless mining of Earth's resources through industrialism has left the environment nearly unlivable and extremely hostile to human habitation.
Humanity is forcefully reverted to a simpler lifestyle, relying on barter for the two most valuable resources now: Water purifiers, called tabs, and silver, ground up to line the interior of breathing masks, to keep out a painful and fatal airborne disease known as Black Lung.
Anyone caught driving such a vehicle was given the maximum sentence, and numerous people have become bounty hunters, bringing in drivers and other lawbreakers in exchange for tabs and silver, dead or alive.
She brings the body back to claim the reward from Sheriff Grubbs, a slightly corrupt and greedy lawman of New Montana.
He tells her of a massive reward for Thomas Jackson, an unusually industrious outlaw who is building a shelter-town for criminals, calling it Defiance.