California is set to begin its first cap-and-trade auctions of pollution permits, as part of the state’s land-mark AB 32 climate change law. The auction marks what some environmentalists see as a major step to put a price on carbon emissions and address global warming. But some environmental justice groups say the cap-and-trade program fails to protect the people most affected by industrial polluters, and could set a bad precedent for future action on climate change. Christopher Martinez reports.