Half of New Zealand's birds have gone extinct since humans arrived on the islands. Many more are threatened. Now, researchers estimate that it would take approximately 50 million years to recover the number of bird species lost since humans first colonized New Zeal"The conservation decisions we make today will have repercussions for millions of years to come," says Luis Valente of Museum für Naturkunde in Berlin. "Some people believe that if you leave nature alone it will quickly recuperate, but the reality is that, at least in New Zealand, nature would need several million years to recover from human actions -- and perhaps will never really recover."and.
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