Guardian: The government must urgently begin improvements to make Britain’s 25m homes more energy efficient if it is to reduce the UK’s carbon footprint by 80% by 2050, a report says today. The report, by the Green Building Council (GBC), says some homes are so environmentally harmful that they may have to be demolished. It also wants the government to introduce a system of “green mortgages” to pay for improvements such as new windows and boilers. All new homes must be zero-carbon from …