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But there are other alternatives to heat pumps. In theory, gas boilers could be low carbon if they use a non-fossil gas made from clean sources. This means that gas made from the anaerobic fermentation of biomass such as manure and farm waste could play a role. According to the Climate Act, the country's biogas industry aims to deliver two billion cubic metres of green gas by 2030, of which a substantial amount could be used to heat buildings. Current annual production still stands at 0.14 billion cubic metres. For comparison, buildings in the Netherlands currently use around 11 billion cubic metres of natural gas.

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