Field notes on carbon, measured honestly.
Sourced, numbers-first writing on footprints, emissions, and what actually moves the needle. No greenwashing, no offsets to sell.
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The average carbon footprint by country — and why the gap is so wide
From under 2 tonnes to over 30, per-person CO₂ varies enormously by country. A sourced tour of the numbers, the territorial-versus-consumption catch, and what 'average' should mean to you.
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The carbon footprint of a beef burger (vs chicken and beans)
A single beef burger carries roughly 3–6 kg of CO₂e — more than ten times a bean burger. Here's the sourced breakdown, where the emissions actually come from, and how the swaps compare.
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The carbon footprint of Bitcoin — and why Ethereum is now different
Bitcoin's network uses about as much electricity as a mid-size country. But 'per transaction' numbers mislead, and Ethereum cut its energy ~99.9% in 2022. The sourced, careful version.
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The carbon footprint of clothing: jeans, t-shirts, and fast fashion
A pair of jeans can carry 20–30 kg of CO₂e over its life; a cotton t-shirt 2–7 kg. Here's where the emissions hide — and why wearing things longer beats almost every other fix.
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The carbon footprint of a cup of coffee (it's mostly the milk)
A black coffee is about 0.05 kg CO₂e; a large latte can be five times that — and the difference is almost entirely the milk. The sourced numbers, and the one swap that matters.
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How much CO₂ does flying actually produce?
One long-haul return flight can outweigh a year of careful choices elsewhere. Here's what a flight really costs in CO₂ — including the contrail effect most calculators quietly ignore.
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How much CO₂ does driving a car produce?
An average petrol car emits two to three tonnes of CO₂ in a typical year. Here's the per-kilometre math, how electric really compares on a real grid, and what changes the number most.
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Beef, chicken, or plants: what your food does to the climate
The carbon footprint of food swings more than tenfold depending on what's on the plate. The data is unusually clear about where it concentrates — and it isn't 'local versus imported'.
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The carbon footprint of home heating — and why the heat pump wins
Heating a home with a gas boiler can emit 2–4+ tonnes of CO₂ a year — often the single biggest line in a cold-climate footprint. Here's the math, and how a heat pump changes it.
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The carbon footprint of streaming, email, and AI — smaller than you've heard
Your digital life has a real carbon cost, but it's routinely exaggerated. Here are the sourced per-use numbers for streaming, email, and an AI query — and where the genuine concern actually lies.
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Do carbon offsets actually work? Mostly not — here's why
Buying an offset feels like closing the loop. The evidence says most voluntary credits don't deliver the cuts they sell. A sober look at additionality, permanence, and what to do instead.
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Electric vs petrol car: at what mileage does the EV actually win?
An electric car starts with a bigger carbon debt from its battery, then pays it back in roughly one to two years of driving. Here's the sourced break-even math — and how the grid changes it.
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Flying vs train vs driving: emissions per passenger-kilometre
Per passenger-kilometre, the train is typically 5–10× lower than flying or driving alone. Here's the sourced comparison — and the occupancy and distance caveats that flip it.
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Is recycling actually worth it for the climate?
Recycling genuinely cuts emissions — recycling aluminium saves about 95% of the energy of making it new — but it's the smallest of the three Rs. A sourced look at what it does and doesn't fix.
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Paper vs plastic bags: which is actually better for the climate?
On climate alone, a thin plastic bag often beats a paper one — paper takes more energy to make. But reuse changes everything. The sourced answer, and why the question is the wrong one.
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What is a carbon footprint? And what the number actually means
A carbon footprint is the greenhouse gas your year adds to the atmosphere, in one number. Here's how it's measured, what the global average really is, and which choices actually move it.