From Ohio Green Strategies blog:

A recent report released by the Environment America Research & Policy Center shows that Ohio’s renewable energy and energy efficiency regulations cut the state’s carbon pollution “by at least 4.7 million metric tons in 2012, an amount comparable to the annual emissions from nearly one million cars,” according to the Gongwer Ohio Report. Of that total, the state’s renewable energy standards have offset the equivalent carbon produced by 125,000 cars produced in a year, while the energy efficiency requirements offset the equivalent carbon produced by about 567,000 cars annually. The report comes at a time when Senate Republicans just last week passed a measure freezing these benchmarks at 2014 levels for two years

For more, read the full report.