Perspectives
Large oil companies cannot let go of their resources or natural gas. So they are pushing for blue hydrogen, so they can continue to pumping fossil fuels out of the ground for decades to come. China and Europe would compete on green hydrogen, however, most likely with solar domination; China would control the green hydrogen market. According to news, they have started investing in large scale electrolysers, which would reduce costs in say 10 years. Europe has offshore wind plus hydrogen, but that cannot be scaled around the world. Solar plus electrolyser is the way to go.