The concept of 'de-extinction'—bringing extinct species back to life through advanced genetic engineering—has gained traction among scientists and conservationists. Proponents argue that this technology offers unprecedented opportunities. First, de-extinction could restore biodiversity by reintroducing keystone species into degraded ecosystems. For example, the woolly mammoth, if resurrected, could help maintain Arctic grasslands by trampling snow and promoting grass growth, thereby combating climate change. Second, the process would drive significant scientific innovation. Developing techniques for genome editing, cloning, and surrogate pregnancies would push the boundaries of biology, with potential spin-off benefits for medicine and agriculture. Third, de-extinction serves as a powerful conservation tool by raising public awareness and funding. High-profile projects like the passenger pigeon might inspire people to protect existing endangered species, as the spectacle of resurrection captures global imagination and encourages donations to conservation efforts.
🎧 听力讲座
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The lecture challenges the feasibility and desirability of de-extinction. First, the ecological benefits are highly speculative. Even if we resurrect species like the woolly mammoth, the current Arctic ecosystem has changed dramatically; introducing them could disrupt existing food webs rather than restore balance. Moreover, the few individuals produced would lack the genetic diversity needed to form a viable population, making them unlikely to have any ecological impact. Second, the scientific innovation argument is flawed. The resources spent on de-extinction would be far better allocated to preserving existing biodiversity, which is facing immediate threats. The technology developed, while novel, is extremely costly and inefficient, and its spin-off benefits are uncertain; meanwhile, we already have proven methods—like habitat protection—that work. Third, the public awareness claim is misleading. While de-extinction might attract short-term media attention, it could actually distract from pressing conservation issues, such as climate change and poaching. People might feel that extinction is not permanent, reducing urgency to save endangered species. In fact, funding for de-extinction could divert scarce resources away from more effective conservation programs.
📝 写作提示 Summarize the points made in the lecture, being sure to explain how they cast doubt on the specific points made in the reading passage.
