SotA-R-9: Some Comments on Model 4 (and Another Error)
[(This is part 9 of the “Stages of the Anthropocene, Revisited” Series (SotA-R).) The latest iteration of the model I have been developing in this series in an attempt to predict how much carbon we are going to emit in stage 1 of the anthropocene predicted that we’ll heat up the planet by about 3.3°C (67% interval: 2.3~5.0°C), and that this will imply (or involve) widespread famines, civil war, refugee crises, and societal collapse. Rather than take that prediction for granted, it seemed a better idea to compare this prediction with some other predictions, and to have a closer look...
Carbon-neutrality by 2050 (version of June 2022)
(Originally published on December 15, 2020. This version: June 13, 2022. The latest version can be found here.) In the year before publication of the original version of this article (2020) several governments announced that their countries will be carbon neutral by 2050. (Since then, other countries have joined them, but often with different target years. China and India, the world’s two most populous countries, aim for 2060 and 2070, respectively, for example.) This is a cheap promise, as the target is so far in the future that it doesn’t commit them to do any significant now, but even if...
SotA-R-8: Climate/Society Feedback Model 4 Predicts 3.7°C of Average Global Warming
(This is part 8 of the “Stages of the Anthropocene, Revisited” Series (SotA-R).) (This post was updated on July 28.) — Earlier this year I found a serious error in the equations I was using to calculate warming due to carbon emissions. As explained in March, this meant that the climate/society feedback models presented in the previous three episodes in this series were all wrong, and thus that I needed to patch up the latest iteration of those models. The result of that “patching up” is model 4, which is mostly identical to model 3. The only differences are the...
CO₂ Emissions and Global Warming — Have All My Calculations Been Wrong?
Yes. — That’s the short answer to the question in the title. An obvious follow up question would then be: By how much? — That’s where things gets complicated. There have been quite a few articles in this blog that relied on equations to estimate average global warming. Typically this involves two equations. One estimates atmospheric carbon increases as a function of CO₂-e emissions. The other estimates average global warming as a function of atmospheric carbon increases. To model things like the feedbacks between climate change and social change as in the ongoing Stages of the Anthropocene, Revisited series, and...
SotA-R-7: Current Models Predict 4°C of Global Warming
(This is part 7 of the “Stages of the Anthropocene, Revisited” Series (SotA-R).) Important Note (March 3, 2022) Due to a fundamental flaw in models 1, 2, and 3 in this series, the predictions for average global warming in this article are unreliable. Update (May 21, 2022) Model 4 fixes this problem and predicts +3.7°C. There’s no plausible peaceful path to carbon-neutrality. If there’s one key takeaway from my attempts to model carbon (CO₂-equivalent) emissions in stage 1 of the anthropocene, it’s that. Oh, and that’s it will get hot, of course. Unpleasantly hot. This the fourth in a series...
SotA-R-6: Modeling Carbon Emissions – New Results, and Thoughts on Further Models
(This is part 6 of the “Stages of the Anthropocene, Revisited” Series (SotA-R).) Important Note (March 3, 2022) Due to a fundamental flaw in models 1, 2, and 3 in this series, the predictions for average global warming in this article are unreliable. Update (May 21, 2022) Model 4 fixes this problem and predicts +3.7°C. As mentioned in the section “limitations and alternative approaches” of the previous episode in this series, there were a couple of things I wanted to change in the model (i.e. spreadsheet) used to simulate global carbon (CO₂-equivalent) emissions in stage 1 of the anthropocene. The...
SotA-R-5: Modeling Carbon Emissions in Stage 1 of the Anthropocene – a First Attempt
(This is part 5 of the “Stages of the Anthropocene, Revisited” Series (SotA-R).) Important Note (March 3, 2022) Due to a fundamental flaw in models 1, 2, and 3 in this series, the predictions for average global warming in this article are unreliable. Update (May 21, 2022) Model 4 fixes this problem and predicts +3.7°C. The aim of this series is a better prediction of the long-term prospects for human civilization (in the context of climate change) than the rather sketchy predictions made in Stages of the Anthropocene three years ago. The previous episodes in this series discussed some relavant...
SotA-R-4: Preliminary Notes on Modeling Carbon Emission Scenarios in Stage 1 of the Anthropocene
(This is part 4 of the “Stages of the Anthropocene, Revisited” Series (SotA-R).) The purpose of this series is an update of the mid- and long-term prediction of aspects of the global climate relevant for the prospects of continuing human civilization in Stages of the Anthropocene. The idea is to develop a model that can be relatively easily expanded, fine-tuned, and corrected when new or better information becomes available. The present episode in the series consists of a number of notes of a relatively technical nature on how to build this model. CO₂ emissions and economic growth The level of...
The New Denialism
The old denialism denied the reality of climate change. Funded by the fossil fuel industry it spouted disinformation and lies and fostered doubt. It changed climate change from an objectively observable fact into a political “opinion”. The old denialism is dead. Not even the fossil fuel industry denies climate change anymore. A new denialism has replaced it, however. The new denialism doesn’t deny climate change. In the contrary, it emphatically affirms it. The new denialism doesn’t deny that climate change is a serious problem either – it admits that too. What the new denialists deny is how big the crisis...
SotA-R-3: Heat and Cyclones
(This is part 3 of the “Stages of the Anthropocene, Revisited” Series (SotA-R).) Drought is (obviously) not the only kind of disaster caused by climate change, although it is probably the most severe in terms of its (long term) effects. Other types of “natural” disaster that have to be taken into account given the purpose of this series include heatwaves, storms, and other forms of extreme weather. The focus in the present article will be on heat and tropical cyclones (including hurricanes and typhoons). heat While there are several papers projecting aspects of heat as an effect of climate change,...
SotA-R-2: Drought and Its Effects in the 2030s and 40s
(This is part 2 of the “Stages of the Anthropocene, Revisited” Series (SotA-R).) Of all climate-change-related disasters, drought may very well be the worst. While other kinds of disasters might look more disastrous because of the clearly visible damage they cause, droughts destroys livelihoods. Drought is associated with water shortages (obviously), crop failures, famine, migration/refugees, and violent conflict (including civil war and war). Furthermore, droughts tend to affect larger areas, and the effects are, therefore, widespread. Persistent drought can make once fertile and pleasant lands inhospitable or even uninhabitable. For these reasons, significant changes in global precipitation patterns can have...
Stages of the Anthropocene, Revisited
(This is part 1 of the “Stages of the Anthropocene, Revisited” Series (SotA-R).) In Stages of the Anthropocene (2018), I argued that if one aims to make mid- or long-term predictions of the effects of climate change on human civilization, it is useful (if not necessary) to distinguish three phases or stages within the time period known as the “anthropocene”. There is some disagreement about when the anthropocene started – the industrial revolution (mid 18th century) and the advent of the atomic age (mid 20th century) have been suggested, and an argument has even been made for the emergence of...