Hollywood producer and press agent Walter Seltzer died on the 18th February 2011, aged 96. He collaborated with actor Charlton Heston on a number of films, including the adaptation of Harry Harrison's book Make Room! Make Room! which became Soylent Green. The obituary published in The Guardian newspaper for 6th April 2011 quotes Seltzer as saying that both he and Heston agreed that "the greatest social problem of our time was over-population. We became a little obsessed with the idea."