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DOINGA R K A N S A SA WORLD OF GOODNATURAL GAS IS A B U N D A N TNorth America has at least a 120-year supply* of natural gas. And as we developlarge reserves that five years ago weren’t possible to produce, that supply is growing.It’s vital because many experts agree that global oil production has peaked, even asdemand is still rising. Because of its growing abundance, domestic natural gas willplay a major role in meeting our 21 st century energy needs. By finding and producingmore U.S. natural gas, we’re Doing a World of Good.CHK.COM • LITTLE ROCK, AR • 501-374-4005 • NYSE:CHK* Potential Supply of Natural Gas in the U.S., Golden, CO, Sept. 2007; Potential Gas Agency, Dec. 2006