1) The Great Barrier Reef in Australia is the largest living structure on Earth and can be seen from space.

2) The word "umbrella" contains three vowels: U, E, and A.

3) The global response to climate change includes the Paris Agreement, an international treaty aiming to limit global warming and strengthen countries' efforts to address climate change through mitigation and adaptation strategies.

4) The ancient city of Pompeii was preserved under layers of volcanic ash after the eruption of Mount Vesuvius in 79 AD, providing valuable insights into Roman life.