Whatever happened to ZPG? Too many people. Too many greedy people. If zero population growth can't be curtailed voluntarily, then why shouldn't it be slowed mandatorily?

We might at least save the fish:

90% of the world’s surviving sturgeon live in the Caspian Sea , site of a fierce battle between fish and illegal fishermen that is slowly leading to the fish’s extinction. Since the Soviet Union collapsed, opening the way to murderous consumerism, the official sturgeon catch in the part of the Caspian once controlled by Moscow has shrunk from over 15,000 tonnes in 1990 to just 650 tonnes in 2001. Poachers (with guns, illegal trawling nets and computers to track the fish) are believed to grab thousands of invisible tonnes more.