Former New York City Mayor Michael R. Bloomberg talks to Gina McCarthy and Lennox Yearwood Jr. at The New York Times Climate Forward event about the detrimental impact of the petrochemical industry. And Bloomberg, who’s 81 years old, talks about setting up plans for his succession. David Gelles of The New York Times interviewed: Michael R. Bloomberg U.N. special envoy on climate ambition and solutions, founder of Bloomberg L.P. and Bloomberg Philanthropies and former mayor of New York City Gina McCarthy Former national White House climate adviser and administrator of the Environmental Protection Agency Lennox Yearwood Jr. President and C.E.O. of the Hip Hop Caucus