The Paris Agreement, also known as the Paris climate accord, is an international treaty aimed at combating climate change. It was signed in 2015 and came into effect in 2016. The agreement has been ratified by 189 countries and the European Union, making it one of the most widely supported treaties in history.

The Paris Agreement commits signatories to limiting global warming to well below 2 degrees Celsius above pre-industrial levels, and to pursue efforts to limit the increase to 1.5 degrees Celsius. The agreement also calls for countries to regularly report their greenhouse gas emissions and take actions to reduce them.

So, what nations are in the Paris Agreement? The answer is almost all of them. As mentioned earlier, 189 countries and the European Union have ratified the agreement. The only major countries that have not joined are the United States, which withdrew from the agreement under former President Donald Trump, and Iran, which has signed but not yet ratified the agreement.

However, the United States has rejoined the Paris Agreement under President Joe Biden`s administration. The United States officially rejoined the agreement on February 19, 2021, with President Biden signing an executive order on his first day in office to rejoin the accord.

The Paris Agreement has been hailed as a major step forward in the fight against climate change, as it represents a consensus among countries from all over the world to take action to address this global challenge. The agreement also provides a framework for international cooperation on climate issues and encourages countries to work together to find solutions.

In conclusion, the Paris Agreement is a vital international treaty aimed at addressing climate change. With the vast majority of countries in the world signed up, the Paris Agreement represents a global commitment to reducing greenhouse gas emissions and preserving the planet for future generations.