https://phys.org/news/2018-07-beach-economists.html

Cost-benefit analysis has been so successful as a tool for policy analysis that every administration since Reagan has endorsed using it. However, it requires measuring benefits that are not "priced" in typical markets. Fortunately, putting a price on non-market environmental outcomes, such as safer drinking water and fewer deaths from exposure to dirty air, has proved to be possible, and highly valuable. These estimates help to make the case for actions such as cleaning up beaches and protecting scenic areas as parks.

According to a preliminary estimate from the U.S. Bureau of Economic Analysis, outdoor recreation adds US$373 billion to the U.S. economy yearly. That's 2 percent of our annual gross domestic product – more than agriculture, mining or utilities, and approaching the economic contribution of national defense.