Paul Simpson is a co-founder of CDP. The charity, formerly the Carbon Disclosure Project, has been at the forefront of climate change campaigning since 2000. They work with 7,000 companies in 90 countries to help them decrease their use of fossil fuels, increase uptake of renewable energy, and collectively reduce global emissions. In this in-depth interview, he discusses the link between rising global temperature and record-breaking weather events, explains why our food choices have a more profound effect on the environment than we think – and argues that we’re on the cusp of a global attitude change which could be “as big as the industrial revolution”.