Climate and aviation experts are warning that levels of turbulence, and incidents of severe turbulence on airplanes, are likely to get worse due to climate change. The warnings come after a British man died and more than 100 people were injured on board a Singapore Airlines flight from London to Singapore last month. Severe turbulence caused the plane to plummet 1,800 metres in just minutes, forcing it to make an emergency landing in Bangkok. In Perspective, we spoke to Nicolas Bellouin from the University of Reading, who is also Chair in Aviation and Climate at Paris's Sorbonne University. He explained what turbulence is and why it's expected to get worse. He also advised passengers to keep their seatbelts fastened at all times.