For instance, while investigating The Nature Conservancy’s foray into oil and gas drilling, I was struck by a line item in its 2012 financial statements: $22.8 million of the organization’s endowment—one of the largest in the U.S.—was invested in “energy” companies (that figure has since gone up to $26.5 million). Energy, of course, means oil, gas, coal, and the like.II Curious, I soon discovered that most big conservation groups did not have policies prohibiting them from investing their endowments in fossil fuel companies.