Global investment in sustainable energy amounted to $148 billion in 2007, a 60 percent gain over 2006, according to a United Nations report (PDF) Tuesday. That will grow to $600 billion past 2020, reported New Energy Finance, a consultant to the U.N. Environment Programme.

Environmentalists have hailed recent announcements by the US Interior Department that purport to protect wildlife, but both of these announcements carry with them asterisks that should give greens pause. On Friday, the Interior Department's Bureau of Land Management announced that some 340 square miles of ecologically sensitive land in the northeast section of Alaska's National Petroleum Reserve will be off limits to drilling.

It's Tuesday morning and the streets of Bangalore are, as always, jammed with traffic and saturated with smog. A young tech worker and his pregnant wife navigate the dusty roads on a tiny scooter, a 125-cc Hero Honda. Srinivasan Chandra's hands sweat onto the handlebars as he waits for the light to turn green. The journey from home to office is only 6 miles, but road conditions and rush hour have turned the four-lane highway into a cross between a parking lot and a demolition derby.

James Dyson is working on a solar-powered car to match the success of his bagless vacuum cleaner. Engineers at the entrepreneur's Wiltshire HQ are developing a lightweight electric motor that could power a family saloon for hundreds of miles.

KINGSTON, Ontario, Jun 25 (IPS) - North America's abject failure to meet the challenge of climate change has been "un-American", environmentalist and scientist David Suzuki told delegates Tuesday at the World Wind Energy Conference, the first ever in the region. "We're facing an ecological crisis, a crisis far, far worse than Pearl Harbour," Suzuki said. Twenty years ago this week, one of the United States' leading scientists warned Congress of the imminent danger of climate change and said that waiting decades to take action was too risky. Now James E. Hansen of the National Aeronautics and Space Administration has published new research indicating that greenhouse gas concentrations have pushed the climate near a dangerous tipping point that will unleash far-reaching changes in the atmosphere and oceans that could take millennia to reverse.

A community in Canada has an unusual form of solar power that can provide over 90% of the annual heating and hot water needs for the homes, despite being situated in a cold Alberta location where winter temperatures can reach -33 degrees C (-27 F). The Drake Landing Solar Community collects solar energy in a heat storage fluid through an array of solar panels on the roof of each home and covering all of the garages at the back of each home. The heated fluid is transferred to a neighborhood energy center, and then into the ground beneath an insulated layer, where the heat is stored in the earth.

Hawaii has become the first state to require solar water heaters in new homes. The bill was signed into law by Governor Linda Lingle, a Republican. It requires the energy-saving systems in homes starting in 2010. It prohibits issuing building permits for single-family homes that do not have solar water heaters. Hawaii relies on imported fossil fuels more than any other state, with about 90 percent of its energy sources coming from foreign countries, according to state data.

The Office of Energy Efficiency and Renewable Energy (EERE), Department of Energy (DOE); and the Bureau of Land Management (BLM), Department of the Interior (DOI), are preparing a Programmatic Environmental Impact Statement (PEIS) to evaluate utility-scale solar energy development, to develop and implement Agency-specific programs that would establish environmental policies and mitigation strategies for solar energy projects, and to amend relevant Agency land use plans with the consideration of establishing a new BLM solar energy development program.

The Bureau of Land Management said it will suspend all new solar energy projects on federal land for the next two years until it completes an environmental impact review. As discussed briefly in the preceding post, the BLM holds the country's most valuable sites in terms of solar energy potential, which are heavily concentrated in the southwest. The federal government owns roughly 650 million acres of land - nearly 30% of its total territory. The vast majority of those lands are located in the Western states and the vast majority of federal lands in the Western states are owned by the Bureau of Land Management. Here's a state by state breakdown of government land ownership.

Something that has long been a dream of mine looks like it will be a reality soon. I have always wanted to see a solar powered solar panel factory, or a wind powered wind turbine factory. Basically you use a little fossil fuels to get started, then the first however many turbines/panels off the line power the factory, from then on in it's all carbon neutral.

MIAMI -- FPL plans to build three photo-voltaic solar energy plants in Florida in the coming year, including one at Kennedy Space Center in Brevard County. The three plants will provide up to 110 megawatts of energy, enough to meet the needs of about 35,000 customers, said Lew Hay, FPL's chief executive officer. A planned 75-megawatt solar center in Martin County would become the largest of its kind in the world, he said.

ON A ridge near Toledo in Castile-La Mancha stands a row of white windmills. Literary buffs, even if they have never been to Spain, will recognise them as the ferocious giants attacked by Don Quixote, Miguel de Cervantes's fictional 17th-century hero. These days, however, they are dwarfed by legions of modern wind turbines that grind out not flour but power, helping to make Spain one of the leading producers of wind-based electricity in Europe.

WIND power works, and will work better in the future. But wind is only an interim stop on the way to a world where electricity no longer relies on fossil fuels. The ultimate goal is to harvest the sun's energy directly by intercepting sunlight, rather than by waiting for that sunlight to stir up the atmosphere and sticking turbines in the resulting airstreams.

James Hansen, one of the world's leading climate scientists, will today call for the chief executives of large fossil fuel companies to be put on trial for high crimes against humanity and nature, accusing them of actively spreading doubt about global warming in the same way that tobacco companies blurred the links between smoking and cancer.

The next technology boom may well be based on alternative energy, says Geoffrey Carr (interviewed here). But which sort to back?

One in four British homes could be fitted with solar heating equipment and 3,500 wind turbines could be erected across Britain within 12 years as part of a green energy revolution to be proposed by the government next week.

Out on a lawn at the Massachusetts Institute of Technology with joggers and traffic passing nearby, Spencer Ahrens is demonstrating what looks like either the future of solar power - or perhaps a death ray.

The solar industry is booming. With waves of investment and grants, the solar power industry is for the first time becoming a serious business. New power plants will soon be pumping power out to consumers, while other firms market to sell panels directly to the consumer, providing them with a more direct means of experiencing solar energy.