1) Bats are the only mammals capable of sustained flight.

2) In recent years, climate change has become a significant global concern, leading to increased efforts to reduce carbon emissions, promote renewable energy, and implement sustainability measures.

3) The Triple Double in basketball refers to a player achieving double-digit totals in three of the following statistical categories: points, rebounds, assists, steals, or blocks.

4) The United Nations (UN) is an international organization founded in 1945 with the goal of promoting peace, security, and cooperation among nations through diplomatic and political means.