Comparisons
Carbon footprint comparisons
Every comparison puts the options on the same functional unit — the same journey, the same kilowatt-hour of heat, the same 100 g of protein — so the numbers can honestly be lined up. Sources are named on each page.
Travel
- Train vs plane (London–Paris)Is the train really better than flying from London to Paris?Up to 55× difference
- Electric vs petrol carDoes an electric car actually emit less than a petrol car?Up to 14× difference
- Cycling vs driving to workHow much carbon does cycling to work actually save?Up to 34× difference
Home energy
Food
Goods and stuff
Want your own numbers?
These are averages. The calculator uses your actual travel, energy and diet to work out where your tonnes really are — two minutes, no sign-up.
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