question: Research the average number of environmental lawsuits filed in the United States each year. Choose from the following options: ('500', '1,000', '1,500') and present your findings in a bullet list with three items. Please exclude the words "court" and "litigation" from your response.
answer: - The average number of environmental legal actions initiated annually in the United States is approximately 1,500.
  - These legal actions often address issues such as pollution, wildlife protection, and resource management.
  - Advocacy groups, government agencies, and private entities are typically involved in these proceedings.