The Paris Agreement is a global agreement signed in 2015 by 196 countries to reduce greenhouse gas emissions and limit global warming to below 2°C. It aims to strengthen countries' abilities to deal with climate impacts and make developing countries financially capable of controlling warming. Countries set voluntary emissions reduction targets every 5 years. While a step forward, the agreement's targets have been criticized as insufficient and its country commitments are non-binding. The US withdrew but later rejoined under Biden. Withdrawal requires following specific rules over a period of years.