NEW YORK ( TheStreet) -- Sure, fossil fuel companies such as ExxonMobil ( XOM), Chevron ( CVX) and Royal Dutch Shell ( RDS.A) 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.