Introducing our IPCC blog series

This blog is the first part of a series from the Cabot Institute for the Environment on the Intergovernmental Panel on Climate Change’s recent Sixth Assessment Report (IPCC AR6). This post is an introduction to the blog series, explaining what we’re aiming to do here and with a glossary of some climate change terms that come up in the later posts. Look out for links to the rest of the series this week.

What is the IPCC?

The IPCC is the Intergovernmental Panel on Climate Change. Formed in 1988 by scientists concerned about the state of the global climate, they’ve been publishing assessment reports on the climate to advise policymakers and governments to act. This year they published their 6th assessment report (AR6), which has been described as their ‘starkest warning’ about the dangers of climate change. The report was built up of 3 Working Groups and over 2800 experts representing 105 countries covering different aspects, from the base science to the sociological impacts of a climate crisis. Alongside their assessment reports, the IPCC also publish special reports on key issues to explore them in more detail. These topics have included Land Use, Impact on the Ocean and Cryosphere and further clarifications on the goal of mitigating 1.5°C global warming.

The IPCC are the most trusted climate group worldwide, with their work being used in policy decisions all over the world.

What are the three Working Groups?

Each of the working groups focuses on a different part of the climate story, looking at causes, effects, and solutions.

• Working Group 1: The Physical Science Basis (WGI)

• Working Group 2: Impacts, Adaptation and Vulnerability (WGII)

• Working Group 3: Mitigation of Climate Change (WGIII)

What is this blog series covering?

The full reports are well over 1000 pages each, with many chapters, subchapters, and footnotes to wade through. As previously mentioned, the full report is split into the domains of the working groups.

Each report from the Working Groups is then filtered down into its own Summary for Policy Makers, which is still dense and features a lot of explanation of evidence. This is further broken down into the headline statements that get released to the press. Even at this level, it’s hard for ordinary members of the public to take the time to read all the evidence and digest the key points.

The aim of this campaign is to distil the key points in each Working Group report in a short, easily understood, and shareable blog as a tool for public outreach. As well as this, the campaign will feature voices from across the Cabot Institute for the Environment including IPCC authors from each of the working groups.

It’s a nearly impossible job trying to filter down the output of thousands of experts into a digestible snippet, but hopefully readers will come away more informed about the IPCC reports and the climate crisis than before.

This week, we’ll be sharing my report summaries here on the Cabot Institute for the Environment blog as well as on Twitter and LinkedIn, starting this Wednesday [27 July] on the output of Working Group I: The Physical Science basis. Keep an eye out for it!

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This blog campaign was written by Cabot Institute Communications Assistant Andy Lyford, an MScR Student studying Paleoclimates and Climate modelling on the Cabot Institutes’ Masters by Research in Global Environmental Challenges program at the University of Bristol.

Converting probabilities between time-intervals

This is the first in an irregular sequence of snippets about some of the slightly more technical aspects of uncertainty and risk assessment. If you have a slightly more technical question, then please email me and I will try to answer it with a snippet. Suppose that an event has a probability of 0.015 (or 1.5%) of happening at least once in the next five years. Then the probability of the event happening at least once in the next year is 0.015 / 5 = 0.003 (or 0.3%), and the probability of it happening at least once in the next 20 years is 0.015 * 4 = 0.06 (or 6%). Here is the rule for scaling probabilities to different time intervals: if both probabilities (the original one and the new one) are no larger than 0.1 (or 10%), then simply multiply the original probability by the ratio of the new time-interval to the original time-interval, to find the new probability. This rule is an approximation which breaks down if either of the probabilities is greater than 0.1. For example

1-in-200 year events

You often read or hear references to the ‘1-in-200 year event’, or ‘200-year event’, or ‘event with a return period of 200 years’. Other popular horizons are 1-in-30 years and 1-in-10,000 years. This term applies to hazards which can occur over a range of magnitudes, like volcanic eruptions, earthquakes, tsunamis, space weather, and various hydro-meteorological hazards like floods, storms, hot or cold spells, and droughts. ‘1-in-200 years’ refers to a particular magnitude. In floods this might be represented as a contour on a map, showing an area that is inundated. If this contour is labelled as ‘1-in-200 years’ this means that the current rate of floods at least as large as this is 1/200 /yr, or 0.005 /yr. So if your house is inside the contour, there is currently a 0.005 (0.5%) chance of being flooded in the next year, and a 0.025 (2.5%) chance of being flooded in the next five years. The general definition is this: ‘1-in-200 year magnitude is x’ = ‘the current rate for eve

Coconuts and climate change

Before pursuing an MSc in Climate Change Science and Policy at the University of Bristol, I completed my undergraduate studies in Environmental Science at the University of Colombo, Sri Lanka. During my final year I carried out a research project that explored the impact of extreme weather events on coconut productivity across the three climatic zones of Sri Lanka. A few months ago, I managed to get a paper published and I thought it would be a good idea to share my findings on this platform. Climate change and crop productivity There has been a growing concern about the impact of extreme weather events on crop production across the globe, Sri Lanka being no exception. Coconut is becoming a rare commodity in the country, due to several reasons including the changing climate. The price hike in coconuts over the last few years is a good indication of how climate change is affecting coconut productivity across the country. Most coconut trees are no longer bearing fruits and thos

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