It's not just about cars and planes. Slowing down a little will go a long way towards lowering emissions.
Kelly will tell a meeting of the International Maritime Organisation that more must be done to tackle emissions from shipping, 'the most urgent and serious' challenge for the industry. She will call for operational improvements such as slowing down ships to maximise fuel efficiency and for more research into hydrogen fuel cells for power.
Martyn Williams, of Friends of the Earth, said: 'There's been a big focus on aviation because the plane is over your head and nobody really notices ships, but globally it's at least the same as aviation, and it will become increasingly significant.'
Norwegian-based Wilh Wilhelmsen, the world's biggest car shipper, has already asked customers to accept slower deliveries. Ingar Skaug, chief executive, said that dropping average speeds of 18-19 knots by just two knots could save 5 per cent of fuel use and emissions alone.
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