Since the 1900's, people have been using machines to help them in any way possible, and eventually they found out what they did to the environment, but that didn't stop them.
I want a dog
Off to work
Then, after the catastrophe of 2020, Things only got worse. Businessmen continued to burn their fossil fuels at a rapid rate. Then, after only five years, the air became too polluted to breathe, so we moved into the ocean.
I hope we all make it
This air better clear up
I hope this gets better
We had to adapt at a structural level. The ones that couldn't grow gills died, and the ones that couldn't blend in and hunt met the same fate. It was survival of the fittest, just like Darwin said.