Energy experts convened by the world's scientific academies Monday urged nations to shift swiftly away from coal and other fuels that are the main source of climate-warming greenhouse gases and to provide new energy options for the two billion people who still mostly cook in the dark on wood or dung fires.

The term "biofuels" suggests renewable abundance: clean, green, sustainable assurance about technology and progress.

Scientists from Spectrolab, Inc., a subsidiary of Boeing, have recently published their research on the fabrication of solar cells that surpass the 40% efficiency milestone—the highest efficiency achieved for any photovoltaic device. Their results appear in a recent edition of Applied Physics Letters.

Economies of scale may apply to alternative energy sources, making them cheaper and more effective in the future.

Private resident in Washington State sets up a hydrogen fuel cell system