Episode 98 of "Stargate-SG1"
s05e10 2001

On a agarian planet, SG-1 meets the Ashen Confederacy (from the episode "2010"). The Ashen are more then willing to trade high-tech. However, process of elimination determines that the Ashen homeworld may be the coordinates that the 2010-future O'Neill sent back on a note to the "present" with instructions to avoid. The President, and the ever-lovable Senator Kinsey, are eager for the treaty to go forward. Meanwhile, Daniel and Teal'c determine that some great calamity befell the population of the agriculture world, reducing them from millions to thousands and eliminating their industrial base. Kinsey keeps O'Neill from interfering, but Carter and the U.S. diplomat manage to trick the Ashen into revealing that they plan to subject Earth's population to a long-term sterilization procedure.