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The Challenges of Carbon Capture
The best way to get hydrogen from water is through electrolysis. The different ways of making hydrogen have led to it being described using a series of colours, grey, blue and green. These indicate how much carbon goes into the atmosphere when it's produced. It would be amazing if we could make all our hydrogen either blue or green. That would cut the amount of carbon dioxide we put into the air enormously. But that goals as Rachel says is some way off.