£6,000 - The average cost per house of meeting zero carbon standards with on-site renewables by 2016, a report from the Renewables Advisory Board estimates. It is less than ten per cent of the building cost.
700 - The approximate number of properties in Sipson that would need to be demolished to make way for a third runway and sixth passenger terminal at Heathrow Airport.
£154 - The cost of retrofitting a home to make it more water-efficient, says an Environment Agency study on making the Thames Gateway water-neutral.
90% - The proportion of material from demolition works on the 2012 Olympic Park site that will be reused or recycled, the Olympic Delivery Authority has said.
60 - The number of trains per day that may be needed by 2030 to carry freight to and from the ports in the north of England across the Pennines, according to a study released by the Northern Way.