Associated Press: Californians will vote on two ballot initiatives this fall that at first glance would seem shoo-ins for approval in a state long associated with environmental activism. The first would require utilities to generate half their electricity from renewable sources such as wind and solar. The second would provide rebates of up to $50,000 for the purchase of alternative-fuel vehicles through a $5 billion bond. Supporters say the measures on the Nov. 4 ballot would help combat global …