Proposition 7 is called The Solar and Clean Energy Act of 2008. We're already seeing a blitz of TV commercials on a measure that has divided environmentalists in California. Current law requires private utilities to get 20 percent of their electricity from renewable sources by 2010. Prop 7 would speed that up by mandating 50% by 2025. Opponents agree on the goal: phase out coal, oil, natural gas and nuclear power sooner; replace them with energy from the wind, the sun, biomass and the tide.