This from the BBC:-

US President Barack Obama is to install solar panels on the White House roof, a move lauded by climate activists as symbolic of the nation’s energy future.

The panels will heat the Obamas’ water and provide some electric power.

In 1979, President Jimmy Carter installed solar panels later removed by Ronald Reagan. George W Bush put panels elsewhere on the White House grounds.

Mr Obama is a supporter of renewable energy but legislation aimed at cutting carbon emissions died in the Senate.

Read more here

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