NEW YORK ( TheStreet) -- Sure, fossil fuel companies such as ExxonMobil ( XOM - Get Report), Chevron ( CVX - Get Report) and Royal Dutch Shell ( RDS.A - Get Report) have been smart investments for decades -- even for environmental groups who treat them like a secret addiction. But climate change is going to change that too. In fact, it's divestment from fossil fuels that's the far smarter, safer move, according to a growing number of experts. Late last month, Forbes featured an article that supported divestment in fossil fuel stocks not just as a viable financial strategy, but a necessary one. That's because though we have more than enough fossil fuel reserves worldwide to depend on for some time, it would come with a huge environmental cost. Divestment hit the mainstream late last year when the environmental nonprofit 350.org, headed by writer and activist Bill McKibben, began advocating for it as a main angle of its climate campaign. In particular, 350.org touts divestment as a powerful tactic in urging fossil fuel companies to begin scaling back on extraction and replace their product with sustainable alternatives such as solar and wind power. The scientific consensus is that we have to leave untouched 80% of our coal, oil and gas reserves to keep average global temperatures from rising more than 2 degrees Celsius (3.6 degrees Fahrenheit) -- the threshold for maintaining a stable climate. Yet according to the International Energy Agency, our emissions are already on a path that will increase average global temperatures between 3.6 and 5.3 Celsius (6.5 to 9.5 Fahrenheit) by the end of the century. The threat of catastrophic climate change and its effects -- flooding, drought and sea level rises -- make continued investments in fossil fuel stocks risky at best. Current fossil fuel reserves may be estimated to be worth as much as $28 trillion dollars, but Forbes contributor Logan Yonavjak warns of a carbon bubble.
Conspicuously missing from the lineup of current and potential divestors are those large green groups that are sounding some of the loudest warning cries about climate change. An article by Naomi Klein in The Nation last spring revealed that a majority of large environmental nonprofits are suspected or known to have large investments in the fossil fuel industry. The Nature Conservancy, for instance, has at least $22.8 million invested in the energy sector. Other groups with large endowments include Conservation International, the Wildlife Conservation Society and the Ocean Conservancy. None of these groups have been forthright about what percentage of their endowments are derived from or invested in fossil fuels. On the other end of the spectrum, green groups such as Greenpeace, Friends of the Earth and the Rainforest Action Network do not have endowments and do not invest in the stock market. And other groups are taking steps to make sure their actions are more consistent with their mission. The Natural Resources Defense Council has stated that it specifically screens out the extractive and fossil fuel industry for direct investments, as does the Sierra Club. Building A Carbon Free Portfolio, Joshua Humphrey's article, Institutional Pathways to Fossil-Free Investing: Endowment Management in a Warming World and Resilient Portfolios and Fossil-Free Pensions, a joint effort of HIP Investor and 350.org. All three not only outline methods for long-term divestment, but also offer suggestions for reinvestment in renewable energy and other solutions for coping with climate change, which they all conclude is a necessary component of any successful divestment strategy. The Aperio Group reported in January that carbon divestment carries very little risk -- much less than 1% (from 0.01 to 0.0006). At the same time, the World Economic Forum found that about $700 billion would be needed annually to address and limit the global impacts of climate change. Divestments in fossil fuel stocks owned by university, nonprofit and corporate endowments -- as well as those in pension funds -- would free up hundreds of billions to tens of trillions of dollars that could be redirected to sustainable development and climate adaptation projects. This could help prevent or alleviate many of the worst impacts of climate change while also benefitting the economy. "A carbon-neutral, and eventually carbon-free, economy is not only possible," Yonavjak writes, "it has become imperative."