Conversation so far:
how many countries have joined the paris agreement
At present, 197 countries, every nation on earth, have adopted the Paris Agreement.
what is the paris agreement
The Paris Agreement is an agreement within the United Nations Framework Convention on Climate Change, dealing with greenhouse gas emissions mitigation, adaptation, and finance
when was the paris agreement signed
The Paris Agreement opened for signature on 22 April 2016, Earth Day, at UN Headquarters in New York.

Question: when did the agreement enter into force
Self-contained rewrite: when did the paris agreement enter into force