The Week in Cleantech is a weekly roundup of our favorite cleantech and alt energy blog posts and stories from across the web. If you know of a good piece that you think should be included here, don’t hesitate to let us know! This week, we particularly liked… On Monday, Jim Fraser at The Energy Blog warned that high grain prices could threaten the viability of ethanol. On Tuesday, Rob Day at Cleantech Investing looked at the numbers for us. On Tuesday, Dana Childs at Inside Greentech told us how an insurer warned oil companies about renewable energy. On Thursday, Neal Dikeman at The Cleantech Blog told us what the trouble was with water. On Friday, Himanshu Pandya at Financial Nirvana gave us the heads up to keep an eye on these stocks during this downturn. Stocks discussed: Suntech Power [NYSE:STP] and Fuel Tech [NASDAQ:FTEK]. On Friday, Worth Civils at the WSJ’s Energy Roundup discussed T. Boone Pickens’ contention that oil production has peaked.