What is hydrogen energy and why is it important?

As governments and industry strive to reduce greenhouse gas emissions to zero, hydrogen and its potential as a clean fuel are making headlines again.

What exactly is hydrogen energy and how could it be used as an alternative to fossil fuels?

See Roger Harrabin, the BBC's energy and environmental analyst, explain.

Find out more about the climate summit:

The world climate summit COP26 in Glasgow in November is considered to be crucial for the containment of climate change. Almost 200 countries are asked about their emission reduction plans, which could lead to big changes in our daily lives.

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