These writings don’t prove that either Jefferson or Adams was an “environmentalist” in the modern sense. But they do show an attitude toward nature that modern environmentalists would recognize. It wasn’t until the end of the 19th Century that the Sierra Club was founded, and environmentalism didn’t become a national force until the 1960s. But we tend to overlook just how deep the roots of environmentalism go in American history.In that sense, environmentalism is as American as the Fourth of July.