Ответ:

  1. Polar bears are endangered because climate change is melting the sea ice where they hunt, so their habitats and prey are disappearing.
  2. Penguins are becoming rare because of climate change, pollution, overfishing, habitat loss and a shortage of food.
  3. Yes. Examples include tigers, rhinos, orangutans and sea turtles.
  4. Yes. People can protect habitats, reduce pollution, limit greenhouse-gas emissions, stop illegal hunting and fishing, and support conservation programmes.