The 2004 lecture that finally convinced David Attenborough about global warming
"...In an interview with the Times in 2017 to publicise the Blue Planet II series, the interviewer Andrew Billen wrote:
“After years of pretty taciturn scepticism, Attenborough finally presented two BBC programmes on the subject, Are We Changing Planet Earth? and Can We Save Planet Earth?, in 2006. He dates his conversion – and he checks the date in his Filofax – to a lecture the American chemist Ralph Cicerone gave in Liège in Belgium on November 8, [2004]. It was important to speak out only when he knew he had the facts right. It can also be argued that when he did speak out, his warning had more impact as the considered judgment of a cautious man.”