The document discusses the causes and impacts of species extinction. It states that habitat loss, pollution, climate change, and human activities like hunting are major drivers of extinction. When species go extinct, it can have catastrophic effects by disrupting food chains and ecosystems. While some extinction is natural, the current rate is estimated to be 1000-10,000 times higher than the background rate due to human factors. Conserving habitats, reducing pollution and mitigating climate change are important to prevent further extinctions.