When Terminal 5 was being planned, there was significant environmental opposition and concerns over carbon emissions and the effects on local habitats, including the path of two rivers. When the project was given the go-ahead, these concerns were taken into account and stringent environmental targets were set for every step of the process, both during construction and for the long term future. The building of Heathrow was a complex project; along with the environmental planning, the entire build had to be completed without any impact on the rest of the activity or infrastructure at the international airport. To achieve this…