Launch giant solar panels into orbit and send limitless clean energy back to Earth

Thousands of acres of super-hairy plants around the world reflect extra sunlight and cool down the globe

A modified nuclear reactor that produces 17,000 barrels of gasoline a day—enough to fuel 54,000 Honda Civics.

Sequester carbon dioxide in six-mile-long sausage-shaped plastic bags on the seafloor

Save six billion kilowatt-hours of energy annually (enough to power 20 million lightbulbs for a year) by blasting brew with supersonic streams of steam

Harness the warmth given off by millions of commuters and reduce global energy demand by 15 percent

Draw power from man-made twisters and light up entire cities

Turn civilization’s lowliest by-products—including human waste and animal carcasses—into clean-burning fuels for commuter transport

Capture 90,000 tons of urine every day from the world’s billion pigs and recycle it into plastic plates

Generate heat and electricity for small-town America using pint-size nuclear reactors that will run for 30 years with no refueling, maintenance or noxious diesel fumes

Full Story: Popular Science

(via < a href="http://www.kurzweilai.net/">Kurzweil)

Some of these seem like better ideas than others…

See also: How Do We Intelligently Discuss Politicized Geoengineering?