It's an odd week for fuel sources. On the heels of a Mountain Dew powered engine, UK supermarket Tesco is getting flack for turning meat into energy-yah, you read that right.

The food chain is burning 5,000 tons of inedible meat for fuel. The biomass processing is being handled by the Cheshire-based PDM Group. The meat-energy is then used to power UK homes via the National Grid.