Every email you send consumes electricity and adds a tiny amount of carbon dioxide to the atmosphere. Since there are so many of us, and each one sends many emails a day, our combined email carbon footprint is enormous. The easiest way to trim it is to stop sending useless emails, such as 'thank' messages.
Here's what a British survey found:
1 email=1g of CO2
64 million Britons won't mind not receiving 70% unnecessary emails sent daily in the UK
16,433 tonnes emissions would be cut cut if each Briton sends 1 less email a day
That's equivalent to cancelling 81,152 London-Madrid flights,or 88,270 Delhi-Mumbai flights