Independent: Britain must embrace nuclear power if it is to meet its commitments on climate change, four of the country`s leading environmentalists — who spent much of their lives opposing atomic energy — warn today. The one-time opponents of nuclear power, who include the former head of Greenpeace, have told The Independent that they have now changed their minds over atomic energy because of the urgent need to curb emissions of carbon dioxide. They all take the view that the building of …