A surge in investment in solar power is bringing down costs of the alternative energy source, but affordability problems still dog hopes for the 1.6 billion people worldwide without electricity.

Tehran distrusts a U.S. initiative to create an international nuclear fuel bank, the secretary of Iran's Supreme National Security Council said Thursday.

Cows could one day help to meet the rise in demand for alternative energy sources, say Ohio State University researchers that used microbe-rich fluid from a cow to generate electricity in a small fuel cell.

President Bush says America needs to rely on alternative sources of energy, including nuclear power, to meet its future needs. VOA's Paula Wolfson reports from the White House, the president focused on the need for more nuclear power plants during a visit Thursday to a facility in the southern state of Alabama.

German Chancellor Angela Merkel says she will not compromise in getting the world's top industrialized nations to agree to cut greenhouse gases that contribute to global warming.

International car manufacturers and energy experts urged to find new sources of renewable energy for vehicles - including advanced biofuels - in a move to reduce the speed of global warming.