With federal action on climate change stalled in the Senate, the next major environmental war is being waged in California, where a ballot measure will soon decide the fate of the most comprehensive piece of greenhouse gas legislation in US history. The measure—Proposition 23—could upset the landmark climate bill Gov. Arnold Schwarzenegger signed into law in 2006. The Global Warming Solutions Act, or AB32, requires that the state decrease emissions down to 1990 levels by 2020—an approximate 25 percent cut from current levels. Implementation of the plan is supposed to begin in 2011. But Prop. 23—whose "yes" campaign is funded largely by out-of-state fossil fuel interests—seeks to delay the cuts until the state’s unemployment stays below 5.5 percent for four consecutive quarters—which, given the economic downturn around the country, and the 12.8 percent unemployment rate in California, might take quite a bit of time to pull off.