Solar panels on the White House

US President Barack Obama is to install solar panels on the White House roof, in a move which will please climate activists and send out a strong message about the nation's energy future. The panels will heat water and provide electric power. "Solar panels on one house, even this house, won't save the climate, of course," global warming activists 350.org wrote on their website. "But they're a powerful symbol to the whole nation about where the future lies."