Tim Castleman had a big response to the Sept. 11 attacks on the United States. He felt so sad, disappointed and angry that he changed his life. He started developing a hemp-based biofuel system and fought for legalization of hemp in Arizona to help end U.S. dependence on fossil fuels. He began a national "Drive 55" campaign to lower Americans' gas consumption and reduce carbon emissions — an effort turned into a documentary. And he organized two "Peace Trains" to Washington, D.C., to promote rail travel. "My interest in biofuels led me to understand the real problem isn't that we need another source of fuel. We need another source of energy," said Castleman, 51. "The real problem is we

  Locals who hit Gold Rush Days over Labor Day Weekend will notice some changes in Old Sacramento.   New business activity including historic building reconstruction is underway. While the addition of new ventures hasn't totally offset the loss of others, tourism revenue for 2009 seems to be holding steady with 2007 and 2006, said Melissa Martinez, executive director of the Old Sacramento Business Association, a business improvement district. "We're staying steady in tourism," said Martinez. "That’s a really good sign." In 2007, retail businesses brought in $2.25 million in sales tax revenue, about the same as 2006. Tax receipts dipped by $129,000 in 2008 — primarily due to the I-5 re