To reverse extinction, scientists, conservationists, and policymakers are using approaches such as de-extinction, reintroduction, and captive breeding. De-extinction involves using genetic engineering to bring back extinct species, with projects like the woolly mammoth and the passenger pigeon being pursued. Reintroduction and captive breeding are also effective approaches, with the California condor and the black-footed ferret being saved from extinction. However, it's essential to consider potential risks and drawbacks of de-extinction, such as the inability of de-extinct species to adapt to current environmental conditions. While bringing back extinct species could mitigate the impact of climate change, it is vital to recognize that comprehensive efforts such as reducing greenhouse gas emissions are still necessary.