How to Profit from Global Warming

It's something big-time investors are increasingly paying attention to.

Last year a group of institutional investors, including BlackRock, that together manage $24 trillion in assets pledged to manage climate change risk as part of their fiduciary duty to clients.

BlackRock is hoping to glean more investing tips from those disclosures. The asset manager is sifting through new data on companies' water management to see how it correlates to stock market performance.