The Elizabeth line could be carbon negative in a decade

Although a lot of CO2 emitting concrete was used in building the Elizabeth line, it could be carbon negative in as little as a decade, according to Crossrail legacy estimates.
Elizabeth line train being tested in a huge freezer – Dec 2016
Crossrail has estimated that the CO2 emissions from the construction phase of the Crossrail project are in the order of 1.7 million tonnes. To put that into context, the UK’s average carbon footprint is about 10 tonnes CO2 per person per year &ndash