Many many homes in Europe are natural gas fuelled. Combined with low-efficiency heating systems (no heat pumps), and bans on fracking (like here in the UK) mean

Many many homes in Europe are natural gas fuelled. Combined with low-efficiency heating systems (no heat pumps), and bans on fracking (like here in the UK) means that countries have an over-dependence on a resource that they import and have no-or-low production of at home.