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takyon writes:

New Zealand will attempt to eradicate rats and other unwanted predators by 2050:

An isolated archipelago, New Zealand once hosted almost 200 bird species, many of them, like the iconic kiwi, having become flightless over generations because of a lack of natural predators. But several recently introduced species, such as rats, possums, and weasellike carnivores called stoats, now kill about 25 million of these native birds every year. Yesterday, the country's prime minister, John Key, announced a $20 million commitment of seed money to set up Predator Free New Zealand Ltd., a company that would lead the charge in ridding the nation of the three mammals and five other foreign predators by 2050. Until now, similar eradication efforts by the country have focused on small islands; those efforts boast a 90% success rate in eliminating rodents, says James Russell, a conservation biologist at the University of Auckland in New Zealand. The new goal, Russell says, is "the modern equivalent to landing someone on Mars" and will ultimately require new technologies and billions of dollars to succeed. But he is optimistic because local communities and organizations, which could foot a large portion of the total bill, are on board.

[...] Also, once eliminated, rats will likely keep coming back in, Merrill notes. "They can do it if they can prevent the rats from jumping off the boats," he predicts. Russell says that's doable. "We are currently close to a 100% success rate in intercepting new mammal arrivals on the islands." New Zealand's track record on its smaller islands bodes well, Martin says. "This challenge is of mind-blowing proportions, but if anyone can do it, the New Zealanders can."

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