Maybe not abolish but scale it back by 50%

Ethanol needs to go away.

Approximately 45% of U.S. corn croplands are used for ethanol production.

Corn feed is also bad. Cows aren’t meant to live off of corn and it makes them unhealthier for us to eat.

Feeding cattle on corn fundamentally changes the meat they produce, greatly increasing levels of unhealthy Omega-6 fatty acids and decreasing levels of healthy Omega-3 fatty acids.  This change greatly impacts the healthiness of meat for human consumption.

There’s also the more recent issue of growing corn in more states drying up the water supply. Corn is a very water hungry crop.
Corn farming in the midwest heavily taxes water resources and supply

More reading.
Corn: The Welfare Crop