N.K. Chauhan 
The UN's climate science body, the Intergovernmental Panel on Climate Change (IPCC) published the third part of its Sixth Assessment Report (AR6).
The second part of the report was published in "March 2022" which was about climate change impacts, risks and vulnerabilities, and adaptation options.
The first part of this report, on the physical science of climate change was published in 2021, It had warned that 1.5 degree Celsius warming was likely to be achieved before 2040 itself.
Third Part
In 2019, global net anthropogenic Greenhouse gas (GHG) emissions were at 59 Gigatonnes of carbon dioxide equivalent (GtCO2e), 54% higher than in 1990.But the average annual rate of growth slowed to 1.3% per year in the period 2010-19, compared to 2.1% per year in the period 2000-09.
Least Developed Countries (LDCs) emitting only 3.3% of global emissions in 2019.
The costs of low emissions technologies have fallen continuously since 2010.
Second part
Over 45% of the global population is living in areas highly vulnerable to climate change.India as one of the vulnerable hotspots, with several regions and important cities facing very high risk of climate disasters such as flooding, sea-level rise and heat-waves.
Multiple disasters induced by climate change are likely to emerge in different parts of the world.
Climate change will have near to long-term Risks, Even if adequate efforts are made to keep the global rise in temperatures within 1.5 degree Celsius from pre-industrial times.
Vulnerability of ecosystems and people to climate change differs substantially among and within regions.
Climate change is increasing vector-borne and water-borne diseases such as malaria or dengue, particularly in sub-tropical regions of Asia.
There are large gaps in the adaptation actions that are being taken and the efforts that are required.
First Part
The first part of its Sixth Assessment Report (AR6) titled - Climate Change 2021: The Physical Science Basis.Global surface temperature is now higher by 1.07°C since the pre-industrial era. The 1.5 degree Celsius warming is likely to be achieved before 2040 itself.
Carbon dioxide (CO2) Concentrations are the highest in at least two million years.
Aerosols contribute to reducing the impact of warming by other greenhouse gases, by almost a third.
Every additional 0.5 °C of warming will increase hot extremes, extreme precipitation and drought.
It says, if greenhouse gas emissions are halved by 2030 and net zero by 2050, global warming can be stopped.
Sea-level rise has tripled compared with 1901-1971
Serious impact on mountain ranges across the world, including the Himalayas.
Heatwaves and humid heat stress will be more intense and frequent during the 21st century over South Asia.
Changes in monsoon precipitation are also expected, with both annual and summer monsoon precipitation projected to increase.
The Indian Ocean has warmed faster than the global average.
India, the third largest emitter in the world was already doing much more than it was required to do.
What is "IPCC" ?
IPCC is the international body for assessing the science related to climate change.It was set up in 1988 by the World Meteorological Organisation (WMO) and United Nations Environment Programme (UNEP) to provide policymakers with regular assessments of the scientific basis of climate change, its impacts and future risks, and options for adaptation and mitigation.
IPCC assessments provide a scientific basis for governments at all levels to develop climate related policies, and they underlie negotiations at the UN Climate Conference - the United Nations Framework Convention on Climate Change (UNFCCC).
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