In the last few decades, technological leaps and the scaled-up production of solar panels have made solar power dramatically less expensive. What started as a technology used to power satellites, telescopes and other vehicles in outer space is now used in homes, office buildings and warehouses.
In many countries, huge solar farms cover acres of land. By the end of the decade, solar energy could become cheaper than local conventional electricity, and the continued growth of the industry could contribute as hundreds of thousands of jobs as a return all over the world.
Wind power is an affordable, efficient and abundant source of domestic electricity. It's pollution-free and cost-competitive with energy from new coal- and gas-fired power plants in many regions. In 2011 alone, 3,463 turbines went up across the United States.
Today, American wind generates enough electricity to power more than 11 million homes, creates steady income for investors and landowners, and helps provide manufacturing, construction and operations jobs for 75,000 Americans.