Environmental groups have criticised the EU's new Energy Efficiency Directive for failing to mandate member states to make big energy savings over the next decade.

According to the European Commission, the plan will deliver 20% energy savings across the union by 2020. However, Friends of the Earth said the directive would "not make savings to the extent promised, or on the scale needed to fight climate change".

As our recognition of the problems of dwindling fossil fuel supplies and climate change grows, the need to reduce the energy consumption and carbon emissions of our homes becomes increasingly apparent. Leading energy consultant Patrick Waterfield describes why and how we should switch to zero heating homes.