Final answer:
The United States aims to diversify energy sources to respond to climate change, the high cost and volatility of oil, and energy security concerns.
Step-by-step explanation:
Another reason the United States is working to diversify energy sources and lessen its dependence on fossil fuels is in response to the emission of greenhouse gases and their growing contribution to climate change, as well as to the high cost of foreign oil payments to supplier countries and energy security concerns. The high price and volatility of oil have led to increased interest in renewable energy sources, particularly following the oil crises in history. The U.S. is prompted to seek alternatives to lessen its reliance on foreign oil and enhance economic stability, create employment opportunities, and improve resilience against natural disasters or other disruptions to energy supplies.