Context: In the coming week, the Geneva based Intergovernmental Panel on Climate Change will release the first part of its Sixth Assessment Report.

• This part of the report will present the latest scientific understanding of the climate system, how and why it is changing, and the impact of human activities on this process.

Background

• The five previous assessment reports that have come out since the IPCC was established in 1988 have formed the basis of international climate change negotiations, and the actions that governments across the world have been taking in the last three decades to restrict the rise of global temperatures. 
• Their value has been globally acknowledged, and the fourth assessment report, which came out in 2007, won the IPCC the Nobel Peace Prize.
• All of them, starting from the first one in 1990, have been categorical in stating that the rise in global surface temperatures since the 1950s was most likely caused by human activities, and that any rise beyond 2°C, compared to the temperatures of the late 19th century, would make the Earth extremely difficult place to live for human beings, and thousands of other species of plants and animals.
• The reports have also presented projections for temperature rise till 2100 under different scenarios and the kind of impacts that can be expected under each of these pathways.

Key Points

• In the last few weeks, the world has seen unexpected floods in Europe and China, record-breaking heat-waves in the United States, and deadly forest fires in Siberia, and Turkey and Greece. 
• Amid gloomy predictions of a continued rise in the frequency and intensity of such extreme weather events, all attributable to global warming, scientists are set to present the most comprehensive health check-up of the Earth’s climate.
• The second and third parts of the report, dealing with the expected impacts of climate change, and the actions required to prevent the worst impacts, are slated to come out next year.

Sixth Assessment Report
Apart from incorporating the latest available scientific evidence, the Sixth Assessment Report is also attempting to provide more actionable information to help governments take policy decisions.

• REGIONAL FOCUS: The Sixth Assessment Report will put much more emphasis on regional assessment. So, it is expected that this report would likely state what the scenarios for sea-level rise in the Bay of Bengal region is, not just what the average sea-level rise across the world is likely to be.
• EXTREME EVENTS: There is expected to be a bigger focus on extreme weather events, like the ones we have seen in the last few weeks. 
• Attribution science is likely to get important space in the report.
• CITIES: Densely populated megacities are supposed to be among the most vulnerable to impacts of climate change. The Sixth Assessment Report is expected to present specific scenarios the climate change impacts on cities and large urban populations, and also implications for key infrastructure. 
• SYNERGIES: IPCC is expected to present a more integrated understanding of the situation, cross-link evidence and discuss trade-offs between different options or pathways, and also likely to cover social implications of climate change action by countries.

Significance

• The IPCC assessment reports have been extremely influential in directing the dialogue and action on climate change. 
• The First Assessment Report led to the setting up of the UN Framework Convention on Climate Change, the umbrella agreement under which international negotiations on climate change take place every year. 
• The Second Assessment Report was the basis for the 1997 Kyoto Protocol that ran till last year, and the Fifth Assessment Report, which came out in 2014, guided the Paris Agreement.
• The global climate architecture is now governed by the Paris Agreement, which replaced the Kyoto Protocol from this year.
• In the immediate future, the IPCC report could serve as the most important warning towards the rapidly closing window of opportunity to halt the rise in temperatures to unacceptable levels, and propel the governments to take more urgent actions.

About UNFCCC

• Signed in 1992 at the United Nations Conference on Environment and Development also known as the Earth Summit, the Rio Summit or the Rio Conference.
• India is among the select few countries to have hosted the COP of all three Rio conventions on climate change (UNFCCC), biodiversity (Convention on Biological Diversity) and land (United Nations Convention to Combat Desertification).
• The UNFCCC entered into force on 21st March 1994, and has been ratified by 197 countries.
• It is the parent treaty of the 2015 Paris Agreement. It is also the parent treaty of the 1997 Kyoto Protocol.
• The UNFCCC secretariat (UN Climate Change) is the United Nations entity tasked with supporting the global response to the threat of climate change. It is located in Bonn, Germany.

Objective: To achieve stabilization of greenhouse gas concentrations in the atmosphere at a level that would prevent dangerous repercussions within a time frame so as to allow ecosystems to adapt naturally and enable sustainable development.