California ? Tough state mandates requiring Californians to reduce their carbon footprints and use more homegrown renewable energy will create more than 400,000 jobs, help consumers save on their lighting bills and boost the state’s economy by $76 billion by 2020.

Those are some of the findings of a study released Monday by Next 10, a nonprofit organization that promotes environmental innovation in California.

The report contrasts sharply with the views of some business groups, which have been critical of the state’s commitment to cut its global warming emissions to 1990 levels by 2020. That landmark 2006 legislation, AB 32, has been labeled a job killer by the California Chamber of Commerce.