Aviation

Hainan Airlines service from Shanghai to Beijing uses 50:50 blend of used cooking oil from restaurants and standard jet fuel

Swiss-built Solar Impulse 2 completes 1,468km flight from Muscat to Ahmedabad as part of round the world attempt

Swiss-built Solar Impulse 2 takes off from Abu Dhabi on 35,000km journey powered only by the sun

Campaign group says Airports Commission has not gathered full range of evidence on the environmental implications of new UK runways

Swiss team behind Solar Impulse 2 reveal planned route for 35,000km circumnavigation that should be completed without using a drop of fuel

New technology and smoother routes are helping NATS save airlines one million tonnes of CO2 and £115m a year - but the company is now aiming far higher

Lightweight seats and trolleys reduce weight of each flight by 250kg, putting company on track to meet fuel efficiency targets

The sectors account for more than five per cent of global emissions yet were not allocated in the Lima accord

Parallel hybrid-electric propulsion system uses 30 per cent less fuel than conventional planes, researchers say

Airport commission says proposals will cost up to £3.4bn more than estimated, meaning higher fares for passengers are likely