What's the carbon footprint of ... a heart bypass operation? | Environment | guardian.co.uk

If you want to go green, look after your health – a major operation compares to two short-haul flights

What's the carbon footprint of ... cycling a mile? | Environment | guardian.co.uk

The carbon footprint of cycling a mile:
65g CO2e: powered by bananas
90g CO2e: powered by cereals with milk
200g CO2e: powered by bacon
260g CO2e: powered by cheeseburgers
2800g CO2e: powered by air-freighted asparagus
...
At 2.8kg per mile this is like driving a car that does six miles to the gallon (a shade over a mile per litre). You'd be better off in a Hummer.

What's the carbon footprint of ... using a mobile phone? | Environment | guardian.co.uk

Mobile phones cause a fairly tiny slice of global emissions, but if you are a chatterbox using your mobile for an hour each day, the total adds up to more than 1 tonne CO2e per year – the equivalent of flying from London to New York, one way, in economy class.

Duncan Clark on the carbon footprint of nuclear war | Environment | guardian.co.uk

Almost 700m tonnes of CO2 would be released into the Earth's atmosphere by even the smallest nuclear conflict, according to a US study that compares the environmental costs of developing various power sources