Clean Development Mechanism was first introduced in which of the following international agreements ?

Clean Development Mechanism was first introduced in Kyoto Protocol.

Kyoto Protocol:

• It is an international agreement that aims to manage and reduce carbon dioxide emissions and greenhouse gases. 
• Kyoto Protocol is an agreement under the United Nations Framework Convention on Climate Change, adopted in December 1997.
• It is a legally binding treaty to reduce greenhouse emissions.
• Annex 1 countries: Includes developed countries and economies in transition. 
• Annex 2 countries: Includes developed countries that provide financial and technical support to the economies in transition and developing countries to assist them in reducing their greenhouse gas emissions. 
• The Clean Development Mechanism allows emission-reduction projects in developing countries to earn certified emission reduction (CER) credits, each equivalent to one tonne of CO2. 
• These CERs can be traded, sold, and used by industrialized countries to meet their emission reduction targets under the Kyoto Protocol.

1. The Montreal Protocol on Substances that Deplete the Ozone Layer, also known simply as the Montreal Protocol, is an international treaty designed to protect the ozone layer by phasing out the production of numerous substances that are responsible for ozone depletion. 

2. Rio-Summit produced conventions dealing with climate change, biodiversity, forestry and recommended a list of development practices called Agenda 21. It gave the concept of sustainable development to be combined economic growth with ecological responsibility.

3. The Paris Agreement sets out a global framework to avoid dangerous climate change by limiting global warming to well below 2°C and pursuing efforts to limit it to 1.5°C. It also aims to strengthen countries' ability to deal with the impacts of climate change and support them in their efforts.