Carbon is officially the guy no one wants at the party anymore. President Obama came out strongly for carbon constraints in his recent speech, China will soon introduce a carbon tax, and the European Union has various mechanisms in place to put a price on carbon. In the video below, Motley Fool contributor Sara Murphy discusses some potential risks and opportunities that would emerge if carbon were to become more expensive. Spoiler alert: Natural gas comes out looking pretty good.

Sara Murphy has no position in any stocks mentioned. Follow her on Twitter @SMurphSmiles. The Motley Fool recommends Clean Energy Fuels. Try any of our Foolish newsletter services free for 30 days. We Fools may not all hold the same opinions, but we all believe that considering a diverse range of insights makes us better investors. The Motley Fool has a disclosure policy.