ANN ARBOR, Mich. — What can you — just one concerned person — do about global warming?

It may feel like a more urgent problem these days, with proposed cuts to the Environmental Protection Agency and each year warmer than the previous one.

You could drive a few miles fewer a year. Reduce your speed. Turn down your thermostat in winter. Replace your incandescent light bulbs with LEDs. Reduce your meat consumption. Any one of those actions would help.

But none would come close to doing as much as driving a fuel-efficient vehicle. If vehicles averaged 31 miles per gallon, according to our research, the United States could reduce its carbon dioxide emissions by 5 percent.