Answer: Transportation and electricity generation
Step-by-step explanation:
According to Arnold and Bustos, the two sectors of the United States economy that are the most carbon-intensive are the transportation sector and the electricity generation sector.
The transportation sector contributes a lot to the emissions of greenhouse gas emissions as they typically come when fossil fuel for ships, vans, planes, motorcycles, cars etc are burned. Also, the generation of electricity is also carbon intensive as carbon is being powered in order to generate electricity.