Mrs. Edwards, wife of presidential candidate Sen. Edwards (D-NC), has decided that is time to do something to stop global warming. No, she hasn't promised to reduce her use of private jets, or SUVs, or even moderate the thermostat at her mansion. Instead, she will make a "sacrifice" and not buy tangerines. Tangerines, you see, are not local produce in North Carolina and must be trucked in thereby contributing to carbon emissions. We'll see if others join the Edwards in their courageous stand.