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Clean, renewable energy sources may be more practical than previously thought, according to a Stanford study. The study analyzed the costs and benefits of shifting California’s power supply to renewable sources.

The immediate costs of creating infrastructure to support wind, solar, geothermal, and water power would be high. But the study estimates that air pollution-related deaths would decline by about 12,500 each year and that the state would save about $103 billion in health related costs annually. With these savings, the project would pay for itself in seven years, the researchers say.

Oil and natural gas currently make up most of California’s energy production, so the proposed transition to 55.5 percent solar energy and 35 percent wind energy—not to mention the shift to 100 percent electric cars—may seem far-fetched. Regardless, the study’s authors are developing similar plans for the other 49 states.

Read more about the plan here.

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