In the 70s, there was a widely promoted theory that Detroit had invented carburetors that would make cars get 100 MPG, but they were suppressed by some Big Oil

In the 70s, there was a widely promoted theory that Detroit had invented carburetors that would make cars get 100 MPG, but they were suppressed by some Big Oil - Big Auto conspiracy. (It was partly promoted by people selling aftermarket carburetors that claimed to, but never did, improve mileage. Some of them used magnets to straighten out the fuel molecules, or something.) But here you can see actual evidence of a similar phenomenon. Slowing down emissions reductions for short-term incentives. Ouch, my poor planet.