Professor Mark Maslin (UCL Geography) and Honorary Professor Iain Hanson (UCL Bartlett School of Sustainable Construction) highlight in The Conversation five ways the avian industry can reduce its carbon footprint. 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