This was covered by Rush yesterday in detail.
It’s not a treaty it’s an accord. An agreement on common goals and intent. But because of the Treaty of Treaties it is supposed to be followed just as if it was a treaty once Obama signed it. However, the Treaty of Treaties has never been ratified either. So The Paris Accord is essentially a BS-layer cake which lawyers will attempt to bully the US into following unless Trump publicly states his intention to not abide and to withdraw Obama’s signature. At that point the member nations of the Accord and climate-scam lawyers have no grounds to penalize or sue the US.
An agreement between nations is a treaty. Many liberals think they can use a synonym and avoid the constitution.