Another grim warning on climate change

The Intergovernmental Panel on Climate Change (IPCC), a global body under the United Nations (UN), has been conducting periodic reviews (every six or seven years) of the state of scientific knowledge on climate change for the last 30 years. The agency is currently in the process of publishing its Sixth Assessment Report (AR6) in three parts. The first part was published in August 2021 by Working Group 1 (WG1) based on scientific modelling by physical sciences. The first part of AR6 made the unequivocal claim, for the first time in three decades, that the impacts of human-induced climate change are now evident due to the global temperature rise of over one degree Celsius due to greenhouse gas (GHG) emissions since the First Industrial Revolution. This was the first time that such scientific attribution could be made. The second part of AR6, prepared by Working Group 2 (WG2) and on vulnerability, impacts and adaptation, was just published this week, and it has reinforced the message that climate impacts are clearly visible everywhere in the world. Having had the opportunity of being a lead author of the IPCC's AR3, AR4 and AR5 in the past, I can provide some context on what the IPCC reports do (and don't), and what the AR6 means for Bangladesh as well as the world. Firstly, the IPCC has grown to become the biggest global collaborative scientific enterprise in the world, with several thousands of scientists from all countries, representing many different disciplines and assessing tens of thousands of scientific papers in different languages from around the world. However, there are two main limitations that must be kept in mind. The IPCC doesn't do any new research, but only assesses existing peer-reviewed scientific publications. And its reports must be policy-relevant, but not policy-prescriptive. In other words, the scientists provide options for policymakers—the decisions are left to the policymakers. 

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