California is the first state make plans to combat global warming with comprehensive reduction of greenhouse gases. It won’t be easy. The first step was Assembly Bill 32, which drew international news coverage when it was passed by the legislature and signed by Governor Schwarzenegger two years ago. It requires a 25% cut in emissions—back to 1990 levels—by 2020. Today, the Air Resources Board is unveiling proposals for implementation, and every sector of the economy would be affected.