“ Soil fertility is an issue with corn production. If woody biomass is the dominant feedstock for Ethanol, then it's likely to be less of an issue. ... (read full comment) ” 

Posted on February 26, 2007 at 8:36 AM EST

“ Solar Concentrators At first glance I didn't see the point--the solar flux is fixed: concentrating it doesn't increase it so why should the... (read full comment) ” 

Posted on November 9, 2006 at 8:58 AM EST