Using hydrogen to heat homes and power vehicles will play a vital part in Britain’s efforts to meet stringent climate targets and can’t be dismissed as an expensive pipe dream. That’s the conclusion of National Grid Plc’s network service operator in its annual Future Energy Scenarios outlook. It anticipates 11 million homes will be heated by hydrogen by 2050, which is half of the number currently using natural gas. To get to a world that limits global warming to acceptable levels, hydrogen will be in widespread use across heat, transport and industrial processes, National Grid ESO said in the report. Policy makers should act immediately to maintain hope of hitting the government’s net-zero carbon emissions target by 2050, the network operator said, urging measures on a “significantly greater scale” than it had suggested a year ago.