Easily, and safely! – but only if it is introduced in a measured way, with public education, and the preparation of all the devices and machines which we are used to. We could take as an example the replacement of town gas (carbon monoxide + hydrogen) by natural gas throughout the industrialised world in the 1960’s. It was swiftly and safely done, but only because of careful preparation. There are no obvious barriers of safety or convenience to our using hydrogen for cooking, heating and motoring