"The biophilia hypothesis is not your run-of-the-mill Berkeley/Al Gore/Eat Your Spinach environmentalism. It does not appeal directly to our sense of stewardship or responsibility. It appeals to a much more base, and common, human proclivity: selfishness. It says, in effect, protect the environment because it will make you happy. For a country like the United States, with the word "happiness" in its founding document, you'd think environmentalists would have latched on to biophilia a long time ago."