Planes across Europe will soon run on renewable fuel made from vegetable oil and animal fat in a bid to tackle climate change and toxic air. The new fuel will pour into planes mixed with traditional kerosene at Geneva Airport from next year but the millions of passengers travelling through the busy hub each year won’t notice the difference. The planes will run just as smoothly and engine performance is even slightly improved, says Matti Leivonen, the boss of Neste, the Finnish company that’s supplying the fuel.