The low carbon world is coming. Wind and solar power are growing fast, but there will always be times when the wind is not blowing and the sun is not shining. So, how will we cope? For the time being, we can use clean-burning natural gas to cover for when renewable electricity is not available, but will there come a time when we can no longer burn natural gas because of climate change? And what happens if the supply of natural gas starts to run out? The author looks at the prospects for a transition from natural gas to low carbon gas, which could take several decades, and at how this will depend on the evolution of the fossil fuel industry. She investigates the technologies and energy systems for making the best use of renewable gas resources, and how this can be important to every sector of the economy.