James Lovelock is a chemist and environmentalist best known as the co-originator of the Gaia Theory, which posits that the Earth is a self-regulating living organism, explained in his book “Gaia: A New Look at Life on Earth.” In 2004, he shocked many environmentalists by coming out in support of nuclear energy when he wrote in the U.K.’s Independent: "By all means, let us use the small input from renewables sensibly, but only one immediately available source does not cause global warming and that is nuclear energy."