Wednesday, September 16, 2015

The Biofuel Grind

Do the Math: "I have acted like we need biofuels to be able to completely replace our current oil consumption in the foregoing analysis. No one who is serious about the matter is proposing we do so, exactly. But I think it’s useful to appreciate limitations to ideas on our horizon so that no one is misinformed or simply assumes that any of the myriad solutions we discuss can plug the hole and make us whole. Don’t trust anyone who says that biofuels are the answer. Fine if they want to say “part of the solution,” but I’m not breathing easy at the claim that they’ll fix our wagon."

Sunday, September 6, 2015

Solar PV increases energy use and greenhouse gas emissions

LOW-TECH MAGAZINE: "It's generally assumed that it only takes a few years before solar panels have generated as much energy as it took to make them, resulting in very low greenhouse gas emissions compared to conventional grid electricity.

However, the studies upon which this assumption is based are written by a handful of researchers who arguably have a positive bias towards solar PV. A more critical analysis shows that the cumulative energy and CO2 balance of the industry is negative, meaning that solar PV has actually increased energy use and greenhouse gas emissions instead of lowering them."