What does ‘abate’ emissions mean in climate change?

Negotiators at the COP28 climate summit in Dubai are grappling over whether to phase out “unabated” fossil fuels. What does that mean? And what does it take to “abate” carbon emissions? The World’s environment correspondent explains the debate, and shows us what it will take to capture and store carbon at a new large-scale capture, transport and storage project in Norway.