By | December 14 2009 3:20 PM

Exxon Mobil agreed to buy XTO Energy this morning for $31 billion in stock. Exxon, the world's biggest oil company, paid a 25% premium for XTO, a big player in domestic energy, especially the shale oil and shale gas that has garnered so much attention lately. Exxon certainly isn't hiding what it's going after... in a report last week, the company forecast energy demand to rise 35% by 2030, with over half of that new demand met by natural gas.