If every adult in the UK sent one less “thank you” email, it could save 16,433 tonnes of carbon a year – the equivalent to taking 3,334 diesel cars off the road
a typical business user creates 135kg (298lbs) CO2e from sending emails every year, which is the equivalent of driving 200 miles in a family car.
Source: https://www.bbc.com/future/article/20200305-why-your-internet-habits-are-not-as-clean-as-you-think