COP 28 has had some success in joining 38 countries such as USA, Germany, Japan, Canada etc at a High-Level Roundtable to reach a common standard on what Green Hydrogen means. This is vital for international trade to be accomplished successfully. It will be interesting to see if the UK Green Hydrogen standard of 2.4kg CO2 emission for each kg hydrogen produced will be accepted as 'low carbon'. There is already a problem because the EU is going for 3.4kg CO2 emission per kg of low carbon hydrogen. It seems to me that if you make hydrogen directly from wind and solar power, then it must be as green as you can get, so the method of calculating CO2 emitted is going to be more interesting than the final numbers obtained. The UK standard already seems poor because it is only 5 times better than the present production by steam reforming natural gas. Why not 100 times better?