As of April 2018, 175 countries have ratified the Paris Agreement, which was adopted in 2015. This agreement is a global effort to combat climate change by reducing greenhouse gas emissions and limiting global warming to well below 2 degrees Celsius above pre-industrial levels.
The Paris Agreement was a historic moment for global climate action, as it was the first time that all countries, including both developed and developing nations, came together to address the issue of climate change. Each country has set its own goals and targets for reducing emissions, and is responsible for reporting its progress to the United Nations.
Some of the biggest emitters, including China and the United States, have already ratified the agreement. However, there are still many countries that have yet to do so. The United States, under the Trump Administration, has withdrawn from the agreement, but other countries have stepped up in its place.
Overall, the Paris Agreement has been a success in terms of global cooperation and commitment to addressing the threat of climate change. However, there is still much work to be done in order to achieve the goals set out in the agreement. It is up to each country to take responsibility for its own emissions and work toward a more sustainable future for all.