It will take an authoritarian goverment but much fossil fuel use can be eliminated. Restrict imports, not much need for shipping. Restrict flying, I am 71 and have never bought an airline ticket or has my wife. Farming, well, as a retired farmer I did enjoy driving my big diesel powered tractors. Mankind survived for thousands of years without tractors, we can again. There are hard hose traveling irrigation guns that run a quarter mile or more out and back, then disconnect from the main water line, mover over, reconnect to the water line and make another round. An electric tractor could do much the same thing. Many millions of
Americans have BS jobs producing nothing, they can become farmers. They could use small battery powered tractors, horses, mules, and even (gasp) hand tools. My dad plowed with mules, didn't kill him, he passed at 93 two months ago. If we quit making ethanol, feeding cows, pigs, and so many chickens we will not need to grow so much corn and soybeans.
Military, no need to go into how wasteful that is. Plastics, eat fresh, buy less consumer goods, we can greatly reduce plastic use. Medicine, I am sure the Cubans can show us a few ways to reduce energy and plastic usage.