1. BIOFUELS:
Competing technologies push to commercialize renewable petroleum

Here's the Earth's recipe for petroleum: Take plants. Add pressure and heat. Bake for hundreds of millions of years. Today, companies are racing to cook the same products, but they want to do it in hours or days. The holy grail is a renewable fuel that no one can tell is renewable. Its price would be similar to that of a barrel of oil. It would be dropped into existing pipelines, refineries and vehicle engines that already process millions of barrels of petroleum a day. Go to story #1