Can green hydrogen play a significant role in stopping or at least slowing down global warming? global warming (also called climate change); pollution and its role in pushing investment in renewable energy; the amount of money likely to be in play; government regulationsnational, state/regional, or municipal--and subsidies which may favor (or disadvantage) investment in renewable energy; the potential in particular countries, including developing countries, for investment in green hydrogen; comparative costs of renewable and fossil fuel technologies; the element of belief, sometimes called dreams, in major investment shifts, e.g., whether the green hydrogen story is part of the dream of the circular economy; the impact of the covid 19 pandemic; and the potential role of millions of electric car owners as a lobbying force to shift the world into a re-thinking of energy and pollutionincluding shifting into the use of green hydrogen