It matters because heating and lighting for homes contributes 14% of the UK's carbon emissions.
The Greens' proposal is to create 100,000 new council homes built to the highest standards of energy efficiency every year for a decade, at a cost of £10.6bn.They also plan to retrofit insulation and green energy into one million more existing homes and premises annually, at an estimated cost of £24.6m.
Annual council house construction has been in steep decline for nearly 30 years, falling from almost 60,000 in the mid-1990s to just 7,000 additional new or acquired council homes last year.And just 7,000 were built in England last year "To do this would be unprecedented," said Luke Murphy of the Institute for Public Policy Research, a think-tank.
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