Scientific American proposes a grand scheme for solar power:

Solar energy’s potential is off the chart. The energy in sunlight striking the earth for 40 minutes is equivalent to global energy consumption for a year. The U.S. is lucky to be endowed with a vast resource; at least 250,000 square miles of land in the Southwest alone are suitable for constructing solar power plants, and that land receives more than 4,500 quadrillion British thermal units (Btu) of solar radiation a year. Converting only 2.5 percent of that radiation into electricity would match the nation’s total energy consumption in 2006.

To convert the country to solar power, huge tracts of land would have to be covered with photovoltaic panels and solar heating troughs. A direct-current (DC) transmission backbone would also have to be erected to send that energy efficiently across the nation.

The technology is ready. On the following pages we present a grand plan that could provide 69 percent of the U.S.’s electricity and 35 percent of its total energy (which includes transportation) with solar power by 2050. We project that this energy could be sold to consumers at rates equivalent to today’s rates for conventional power sources, about five cents per kilowatt-hour (kWh). If wind, biomass and geothermal sources were also developed, renewable energy could provide 100 percent of the nation’s electricity and 90 percent of its energy by 2100.

While British researchers see environmental dangers everywhere, except in massive installations of solar panels:

the great environmental concerns of the future should be nanomaterials, manmade viruses and biomimetic robots.

So say researchers, policymakers and environmental campaigners, who have identified 25 potential future threats to the environment in the UK, which they say researchers should focus on.

In addition to well-publicised risks such as toxic nanomaterials, the acidification of the ocean and increasingly frequent extreme weather events, the list includes some more outlandish possibilities. These include:

• Biomimetic robots that could become new invasive species.

• Experiments involving climate engineering, for instance ocean 'fertilisation' and deploying solar shields

• Increased demand for the biomass needed to make biofuel.

• Disruption to marine ecosystems caused by offshore power generation.

• Experiments to control invasive species using genetically engineered viruses.