The Democratic Party is one of the two major political parties of the U.S..
The correct answer is: "Clean energy sources will help the environment as well as the economy".
The Democratic Party fights for environmental causes, such as the greenhouse effect, global warming, pollution, etc. The former President of the U.S. Barack Obama, a democrat, pledged to fight against climate change (Paris Agreement), which is an example of the work the Democrats do in this area.