Climate Change Committee: Half of homes need heat pump by 2040

Mark Poynting and Justin RowlattBBC Climate & ScienceGetty ImagesFour in five cars should be electric and half of homes should have heat pumps within 15 years, say the government's independent climate advisers.By law the UK must reach "net zero" - no longer adding to the total amount of greenhouse gases in the atmosphere - by 2050.UK greenhouse gas emissions have more than halved since 1990, largely thanks to…