Which works to solve environmental challenges by raising awareness, fundraising, and influencing policy? government agencies
non-government agencies
international treaties
national laws

non-government agencies

Explanation:

Non-government agencies refers to a group that act independently from the government, but still operated to influence United States' politic. Rather than directly involved in the legislation, non-government agencies influence politic through public support.

By increasing awareness to a certain issue, non-government agencies could make potential voters cast their vote toward a certain candidate which supported by the agencies. That candidate will pass the legislations that the agencies want by the time he/she elected into office.

Example of non-government agencies are Greenpeace, International Rescue Committee, Amnesty International, etc.