Five ways to make aviation more sustainable right now
- Written by Mark Maslin, Professor of Natural Sciences, UCL

Many of us feel guilt when we fly because it is a very obvious source of carbon emissions. Aviation causes around 2.5% of global greenhouse gas emissions. But we do not perhaps feel the same guilt when we walk into a new building, even though global concrete manufacture emits closer to 8%. Or when we jump in a petrol car or...