Oil is the largest contributor to U.S. greenhouse gas emissions, mainly due to its extensive use in transportation.

Oil is the leading source of greenhouse gas emissions in the U.S., driven by its dominant role in powering vehicles, planes, and ships. The transportation sector accounts for the majority of carbon dioxide emissions from oil combustion, contributing significantly to global warming and climate change. In addition to direct CO2 emissions, oil production, refining, and distribution also release methane and other pollutants. Efforts to reduce emissions focus on transitioning to electric vehicles, increasing fuel efficiency, and expanding renewable energy sources. Reducing dependence on oil is a critical step in mitigating the environmental impact and addressing climate challenges.