This is the second video in the TEDed / CERN series created for the TEDxCERN event held on 25 September 2014. Jasper Kirkby explains why scientists need to understand more about aerosols and clouds in order to predict the rise in the Earth’s surface temperature with more precision. The CLOUD experiment at CERN aims to help scientists understand how clouds are formed in the atmosphere, view the full lesson here (link is external)