The carbon footprint of a packet of Walkers Crisps is 75g.
(In April, Walkers Crisps began labelling its cheese and onion bags of crisps with a carbon footprint - how many grams of greenhouse gases were emitted in its production - and that has been rolled out to other flavours. The calculations are done by the Carbon Trust, a private company set up by the government to reduce the UK's carbon footprint. The problem consumers face is can you trust the Carbon Trust.)
Source: BBC News