Hamish Beath

My global decarbonisation pathway, built on www.climatewedges.com It deploys 20 wedges to limit global warming to 1.5 degrees.

An infographic showing the 36 strategies that can deliver at least a wedge of mitigation. It explains the scale of deployment each one needs, across the electricity, industry, buildings, transport, and land use sectors.

There is no single “correct” path to decarbonise.
There are six trillion.

Our new paper in Science puts 36 climate solutions into one common unit, so you can build your own pathways.

Paper: doi.org/10.1126/scie...
App: climatewedges.com

What would your pathway look like?

It was very interesting developing these short @apolitical.bsky.social courses for civil servants on electricity grids, featuring a range of Imperial experts, including @iain-staffell.bsky.social. Any non-experts in government looking to learn about future electricity networks, check these out! 👇

Do climate conferences actually achieve anything? A lot of people have strong opinions, but we wanted measurements, so we look at how the stock market moves during yearly international meetings called COPs – explanation below, or read the paper here:
iopscience.iop.org/article/10.1...

Applications are now open for our MSc programmes in Conservation Science and Practice and Environmental Technology at @imperialcollegeldn.bsky.social 🌍✨

Join a community shaping solutions for a sustainable future.

Apply now 👇

#Sustainability #Conservation #EnvironmentalPolicy #StudyAtImperial

In a UN speech today, President Trump said that "all of these [climate] predictions were wrong".

Back in 2019 I led a research effort to digitize old climate model projections and assess how well they did. Turns out they got future warming pretty spot on!

In a new study, we estimate how much geological CO2 storage capacity would be available when considering social, environmental, seismic and other risks.

Lead author @gidden.bsky.social wrote an extensive 🧵on the work 👇

@natcomms.nature.com

#LowCarbon #MiniGrid assets face risk of asset stranding, with the expansion of or improvement in reliability of national grids. Good #Policy to ensure these assets can interconnect can reduce this risk, + improve reliability, #emissions and costs! Read the paper here: www.nature.com/articles/s41...

The study uses #energy system #modelling to explore different scenarios of national grid/mini-grid reliability in #India, and how under different #scenarios, national grid connected mini-grids can offer a promising solution providing clean, affordable and reliable power.
‪@powerforall.bsky.social

Sharing our new paper in #NatureCommunications on solar-based mini-grids interconnecting with national grids can boost reliability, cut costs + emissions, and reduce the risk of asset stranding, co-led by @benwinchester.bsky.social & with @shivmit.bsky.social, + others! @natureportfolio.nature.com

‘The sorest my legs have ever been’: hordes to descend on Hackney for litter-picking world cup The public-spirited sport of spogomi is catching on across Britain, which boasts its world champion team

Spogomi - the sport of competitive litter picking.

I had no idea this was a thing, but what great idea by the Japanese to help clear up parks & public spaces.

In Hackney Marshes this weekend!

www.theguardian.com/environment/...

Solar PV made up 81% of new power capacity in 2024, putting it on track to meet the global goal of tripling renewable capacity by 2030.

Check out the latest report from REN21 #GSR2025 https://www.ren21.net/renewables-2025-global-status-report-global-overview/

a chart showing that lng is almost as bad for climate as coal

A new International Energy Agency (IEA) assessment of the lifecycle emissions of coal vs LNG shows that LNG only offers a pitiful reduction in emissions compared to coal

Gas talking points present themselves as a 'climate solution', but they're a climate cause

www.iea.org/reports/asse...

⚠️ Scientists find three years left of remaining carbon budget for 1.5°C

The remaining carbon budget for 1.5°C will be exhausted in a little more than 3 years at current levels of CO2 emissions, according to the latest Indicators of Global Climate Change study published today🧵

📒 buff.ly/0BQAsfp

Read the full paper here! iopscience.iop.org/article/10.1... #ClimateChange #ScenarioAnalysis #IntegratedAssessmentModels #Feasibility

GitHub - hamishbeath/IAMEE: IAM Scenario Exporation and Evaluation Framework IAM Scenario Exporation and Evaluation Framework. Contribute to hamishbeath/IAMEE development by creating an account on GitHub.

💻 The framework (named IAMEE) is available in #Python code and is #OpenSource for the community to use and adapt. Code and data are available here github.com/hamishbeath/.... We hope it can enhance the utility of scenario databases for a range of users.

Our framework performs well at selecting contrasting scenarios when looking at primary #energy and #CDR. We also highlight important #trade-offs and #synergies between dimensions, and see regional differences in challenges, like higher societal #resilience challenges for the #GlobalSouth. (6/8)

🌡️ We apply our framework to 1.5°C scenarios from the #AR6 Database. We demonstrate some uses for the framework:

1. Illustrative scenario selection with cluster analysis
2 . Exploring tradeoffs and gaps in the scenario database
3. Understanding regional feasibility/desirability challenges

(5/8)

The framework allows users to explore and evaluate scenarios across seven dimensions:

💰 Economic Feasibility
🪨 Mineral Resource Availability
🏘️ Societal Resilience
🌱 Environmental #Sustainability
⚖️ Interregional #Fairness
💪 Scenario Robustness
📈 Societal Transition Rate

(4/8)

Our paper presents a new, open-source, quantitative, multidimensional framework designed to explore and evaluate these scenarios systematically. It can be used to assess scenarios globally or regionally.

Large collections of #climate action #scenarios are crucial for guiding #policy, but can be challenging to extract insights from. It's helpful to understand the relative feasibility and also desirability for society of scenarios across a range of relevant dimensions 🧭 (2/8)

An exploration and evaluation framework for climate change mitigation scenarios with varying feasibility and desirability - IOPscience An exploration and evaluation framework for climate change mitigation scenarios with varying feasibility and desirability, Beath, Hamish, Mittal, Shivika, Lamboll, Robin, Rogelj, Joeri

🚨Excited to share my new paper published in ERL: "An exploration and evaluation framework for climate change mitigation scenarios with varying feasibility and desirability", co-authored with @shivmit.bsky.social @robinlamboll.bsky.social @joerirogelj.bsky.social tinyurl.com/yh3rspns (1/8)

America is Exporting One of Its Worst Characteristics. It Has to Do With Cars. There are ways to fight back.

"According to the International Energy Agency, in 2023 the growth in big cars increased oil consumption worldwide by 500,000 barrels per day and generated 20 percent of the entire global increase in manmade CO2." Via @davidzipper.bsky.social

Drivers of global tourism carbon emissions - Nature Communications The tourism carbon footprint grew 2.3 times faster than the rest of the economy, reaching nearly 9% of global emissions by 2019. Rapid tourism demand growth (3.8% per year) has outpaced energy efficie...

✈️Tourism carbon emissions: new study in Nature Comms.
🔴Emissions from tourism grew 2x the rate of the wider economy from 2009-2019.
🔴Tourism made up 8.8% of global emissions in 2019.
🔴The 20 highest-emitting countries generated 75% of tourism emissions.

What's Up With That: Building Bigger Roads Actually Makes Traffic Worse The concept is called induced demand, which is economist-speak for when increasing the supply of something (like roads) makes people want that thing even more. Though some traffic engineers made note ...

“We found there’s this perfect one-to-one relationship. If a city increased its road capacity by 10% then driving in that city went up by 10%.” Still one of the best articles on why building bigger roads leads to more driving. Understanding #InducedDemand Via @wired.com www.wired.com/2014/06/wuwt...

We have been banging on about it for more than 10 years, but anyway:
2014: www.nature.com/articles/ncl...
2016: www.science.org/doi/10.1126/...
(and loads of papers ever since)

Of course, some DACCS / BECCS / etc is quite reasonable, the scale (level and growth) is the issue.

Keeping 1.5C as a goal isn't fantastical, it's the only acceptable option.

Moving goalposts allows indefinite broken promises. A fixed goal highlights urgent reality: every extra tonne of CO2 we emit will need to be removed to get back to that agreed level

The longer we stall, the harder it gets.