Many countries made a big plan. 
Many lands made a big plan. 
The Paris Agreement is a big plan to help our world. 
The main goal is to keep the Earth cool. Leaders want to stop the temperature from rising too much. To do this, they must cut greenhouse gas emissions. These are gases that trap heat in the air. Each country makes its own plan to help. They must also tell the world how they are doing.
Some countries have left the plan. The United States left in 2020. Then it joined again in 2021. It left one more time in 2026. Most countries are still part of the plan. As of 2026, 194 members have joined. 
The Paris Agreement is a major international treaty about climate change.
To reach its goals, the treaty uses a special way of working. Instead of leaders telling every country exactly what to do, countries make their own plans. These are called Nationally Determined Contributions, or NDCs. Each country must plan and regularly report on its own work. The agreement asks that each new plan should be even better than the last one. This creates a system where countries try to increase their ambition over time.
Many years of work led to this moment in Paris. In 1992, the United Nations Framework Convention on Climate Change was adopted. Later, in 1997, the Kyoto Protocol set rules for some countries. However, the Kyoto Protocol had some problems with how it worked. In 2015, leaders met near Paris for a big conference. 

The treaty has very specific temperature goals. Leaders want to keep the rise in global temperature well below 2 degrees Celsius. They would prefer to limit the increase to only 1.5 degrees Celsius. 
Understanding this agreement helps us see how the world tries to solve big problems. It is different from older rules like the Kyoto Protocol. The Paris Agreement includes both developed and developing countries in its plans. 
The Paris Agreement is a major international treaty designed to address the global threat of climate change.
The agreement operates through a unique "bottom-up" mechanism. Instead of an international body imposing strict targets on every nation, the treaty uses Nationally Determined Contributions, or NDCs. Each country determines, plans, and regularly reports on its own specific climate actions. While no mechanism forces a country to meet a specific target, the agreement requires that each new plan shows increased ambition over previous ones. This creates a cycle where countries are encouraged to strengthen their commitments over time.
This structure differs significantly from its predecessor, the 1997 Kyoto Protocol. The Kyoto Protocol only regulated emissions for a limited set of countries. In contrast, the Paris Agreement blurs the distinction between developed and developing nations. Now, both types of countries must submit plans for reducing their emissions. This shift was intended to create a more inclusive and comprehensive framework for all global emitters. 
The path to Paris began with the 1992 United Nations Framework Convention on Climate Change (UNFCCC). This foundation led to various negotiations, including the 2009 Copenhagen Accord. While the Copenhagen talks failed to produce a universal treaty, they established the framework for the bottom-up approach used later. In 2015, leaders met at the COP21 conference near Paris, France. 
The treaty aims for very specific scientific goals regarding global temperature. The primary objective is to keep the rise in global surface temperature well below 2 degrees Celsius above pre-industrial levels. Ideally, leaders want to limit this increase to only 1.5 degrees Celsius. 
Participation in the agreement has seen significant shifts in recent years. The treaty opened for signatures on April 22, 2016, which is Earth Day. 
While the agreement provides a vital framework, its effectiveness is a subject of intense debate. Some environmentalists and analysts criticize the treaty for not being strict enough. Global emissions have continued to rise rather than fall since the signing. In fact, 2024 was recorded as the hottest year, with temperatures rising more than 1.5 degrees Celsius. Despite these challenges, the agreement has been used successfully in climate litigation. This has forced some countries and oil companies to strengthen their climate actions. It remains a central tool for international climate policy and cooperation.
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