Environment Report: Congress is debating a cap-and- trade plan to reduce greenhouse gas emissions. But a recent poll determined most people don’t know what cap-and-trade means. Lester Graham reports: A poll by Rasmussen found 76% of Americans don’t know what cap-and-trade is. Person 1: “Putting a price cap on something?” Person 2: “Cap and trade? I have no idea.” Person 3: “Captain Trade? I never heard of him.” Here’s the simple version: cap greenhouse gases. The government …