According to a recent study in a scientific journal, ExxonMobil (NYSE:XOM) and ConocoPhillips (NYSE:COP) are responsible for over 4% of global CO2 emissions since 1750.

For followers of Warren Buffet and investors in Berkshire Hathaway (NYSE:BRK-B) (NYSE:BRK-A), this information may be a bit unsettling. The politics of global warming are certainly still up for debate, but the science, overwhelmingly, is not. 

For value investors, does the prospect of a rock-solid dividend in a stable value company outweigh both the social impact of profiting from these levels of carbon emissions, and the future risk to the bottom line as governments eventually up regulation to try and stem climate change?

In the video below, Motley Fool contributor Jay Jenkins explores the issue -- it's his view that the answer, while maybe difficult to swallow, is obvious.