The document summarizes several important international conventions and protocols related to environmental protection established between 1972 and 2012. The key conventions addressed biodiversity loss through the Convention on Biological Diversity (CBD) in 1992, climate change through the UNFCCC and the Kyoto Protocol in 1992 and 1997, and sustainable development through Agenda 21 in 1992. The Rio+20 conference in 2012 aimed to agree on measures for poverty reduction, clean energy, and integrating economic, social, and environmental pillars of sustainable development.