As we take a look at water security in farming this week, the NFU's water specialist gives us an overview of the issues farmers are facing at the moment. New research looks at why bees are emerging earlier in the year and how this might impact crops. Scientists from the University of East Anglia and the Plymouth Marine Laboratory have installed sensors that can 'sniff' for a gas which could, one day, help mitigate the impact of global warming. Presented by Caz Graham and produced by Beatrice Fenton.