Daily
Short sharp takes. Three minutes or less.
One claim, one number, or one question. Worked out honestly. No preamble, no filler, no guessing at what you already know. New entry most weekdays.
18 April 2026
A cotton tote bag needs to be used at least 131 times before it beats a single-use plastic bag on carbon.
That number comes from a 2018 Danish Ministry of the Environment study comparing full lifecycle emissions of fourteen bag types. Organic cotton needed 149 uses. A paper bag needed three. The reusable cotton bag came out worst in most categories except littering. If you own a stack of totes you forget to bring, you are probably net worse off than someone who just accepts plastic and doesn't litter it. The fix isn't owning the right bag. It's remembering the one you already have.
17 April 2026
More than 90% of the largest rainforest offset provider's credits were found to be phantom.
An 18-month investigation by The Guardian, Die Zeit and SourceMaterial in 2023 looked at Verra, the world's leading rainforest offset certifier. Working with researchers at Cambridge, they found that more than 90% of the rainforest credits examined didn't represent real emissions reductions. The structural problem: offsets rely on counterfactuals, and counterfactuals are almost impossible to verify at scale. If you offset flights via a checkout dropdown, you're probably buying a marketing claim, not a tonne of carbon.
Source: The Guardian / Die Zeit / SourceMaterial investigation (2023)
16 April 2026
Less than 9% of all plastic ever produced has been recycled.
The OECD's 2022 Global Plastics Outlook puts cumulative global plastic recycling at 9%. In the US, the rate for post-consumer plastic waste hovers at 5 to 6%. Recycling rates have been roughly flat for decades despite enormous municipal and consumer effort, because the economics of most plastic grades don't work against virgin plastic. Rinsing yoghurt pots is kind behaviour toward a system that mostly doesn't use the input. Reducing the amount of plastic you buy in the first place is where the actual lever lives.
15 April 2026
GiveWell's top charities save a life for roughly $5,000.
That's GiveWell's 2024 cost-effectiveness estimate for the most-funded malaria and deworming programmes, expressed in lives-saved-equivalent terms. The median American household gave $2,500 to charity in 2022. Directed at the median charity, that probably saves a tiny fraction of a life. Directed at GiveWell top charities, it saves roughly half of one. The allocation delta is larger than the volume delta. Most giving optimisation conversations get this backwards.
14 April 2026
An additional child in a developed country adds roughly 58 tonnes of CO2e per year, accounting for descendants.
Wynes and Nicholas (2017) in Environmental Research Letters put the number at 58.6 tCO2e/year. That dwarfs every other personal lifestyle choice by more than an order of magnitude. The framing 'don't have kids for the climate' is neither realistic nor useful. The framing that is useful: if you're having them, the values you install and the leverage you give them probably matter more than the carbon they'll emit. Raising a child with evidence-based thinking and agency is an investment, not a footprint line item.
Source: Wynes & Nicholas, Environmental Research Letters (2017)
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