The Kyoto Protocol was adopted in 1997 at the Third Conference of the Parties (COP3) to the United Nations Framework Convention on Climate Change (UNFCCC) in Kyoto, Japan.

The primary objective of the Kyoto Protocol was to reduce greenhouse gas emissions, particularly carbon dioxide, in order to mitigate global warming and climate change.

Under the Kyoto Protocol, only developed countries were required to reduce their greenhouse gas emissions, as they were considered to have historically contributed more to the problem.

The Kyoto Protocol set a target for developed countries to reduce their greenhouse gas emissions by an average of 5% below their 1990 levels during the first commitment period (2008-2012).

Developed countries could meet their emission reduction targets under the Kyoto Protocol through carbon trading, the Clean Development Mechanism, and Joint Implementation, which allowed them to invest in emission reduction projects in other countries.

The Kyoto Protocol entered into force on February 16, 2005, after being ratified by the required number of countries.

As of 2023, 192 countries have ratified the Kyoto Protocol, including the European Union.

The Paris Agreement, adopted in 2015, succeeded the Kyoto Protocol as the primary international agreement on climate change.

The Paris Agreement aims to limit global warming to well below 2 degrees Celsius, preferably to 1.5 degrees Celsius, compared to pre-industrial levels, and to achieve net-zero emissions by the second half of the century.

Under the Paris Agreement, all countries are required to submit Nationally Determined Contributions (NDCs), which outline their individual plans and targets for reducing greenhouse gas emissions.

The Global Stocktake in the Paris Agreement is a periodic assessment of collective progress towards achieving the agreement's long-term goals and to inform future actions.

The Paris Agreement entered into force on November 4, 2016, after being ratified by the required number of countries.

As of 2023, 197 countries have ratified the Paris Agreement, including the European Union.

The Paris Agreement is significant because it is the first legally binding global agreement on climate change, sets ambitious goals for reducing greenhouse gas emissions, and promotes international cooperation on climate action.

The implementation of the Paris Agreement faces challenges such as insufficient financial resources, lack of political will, technological limitations, and the need for international cooperation.