LONDON (AFP) - Only nuclear energy can slow down the rapid and potentially devastating warming of the earth, a veteran British scientist and environmental campaigner argued. "Only one immediately available source does not cause global warming and that is nuclear energy," James Lovelock wrote in an opinion piece published in the Independent newspaper. The 84-year-old is best known for fathering the "Gaia Hypothesis" in the mid-1960s that states the earth is alive and maintains conditions necessary for its survival. Lovelock warned that environmentally-friendly energy sources were not being developed quickly enough to replace coal, gas and oil, whose waste gas...