In which year did the UN climate change conference commonly known as Copenhagen summit hold?

According to the realist theory, why do international organisations such as the UN fail to prevent war?

In which year, the Convention on the Elimination of All Forms of Discrimination Against Women was adopted ?

In which year, U. Thant appointed as the Secretary-General of the United Nations ?

Match the LIST-I with LIST-II:

Choose the correct answer from the options given below: