You can change 1 thing about the human race

You can change 1 thing about the human race and you get paid 100 million dollars for doing so.

However, if the world is worse off in 10 years then you are tortured for 100 years. You cannot die for that 100 years and you get teleported back to as you were before you made the change

Do you take the deal and if you do what change do you make?

You cannot make a change that is blatantly targeted at an individual or a group of people (ex: remove racists).