Look at the date in the URL of your article. It's 1981. It's obsolete. Back then they still thought the evidence showed that we were heading for an ice age. A microbe is a biological organism. Hydrocarbons, a type of chemical, produced by biological processes like microbes or algae are called bio oils. ... And gravity is not enough. Billions have been invested in making it work I think Exxon just finally gave up last month. I'm all for it. The most advanced work right now is being done in Morocco where there is the most sunlight and cheap land.... but it isn't happening yet.