Oil companies may be the most profitable companies on the planet. But that's only because we let them destroy the planet for free.
Extracting fossil fuels is a lucrative business. Last year, ExxonMobil made $32.5 billion in profits. But, arguably, it's a business built on shaky foundations. If we were to account for the full cost of fossil fuels to the environment, it might completely wipe out the industry's profitability.