Well folks, buckle up for a wild ride through the land of fossil fuels! It's like a smoke filled, carbon dioxide spewing roller coaster of environmental naughtiness! Leading the charge in the pollution parade are coal, oil, and natural gas. Coal is the dirtiest of the dirty, producing the most carbon dioxide when burned, followed by oil. Natural gas is the least polluting, but don't be fooled, it's still a rascal when it comes to greenhouse emissions. So, there you have it, my eco-warriors - coal is the baddest boy on the block, with oil and natural gas vying for runner-up in this pollution pageant!