Met Office analysis suggests that the UK could experience a 1976-style drought every 10 years, and the Environment Agency said that with the population of London and the South East set to grow by 23% by 2035, action should be taken now.
Modelling suggests some river flows could be cut by up to 80% during the summer in the next 40 years as the climate changes, putting more pressure on businesses that rely on taking water from rivers for irrigation.
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Part of what has gone wrong is that many voters do not see Jeremy Corbyn as a credible prime minister.
The rapper joins previously announced headliners Kasabian and Muse at the top of the bill.
The pair, both believed to be in their 20s, were found at the edge of a road after being hit at a bus stop in the ski resort of La Clusaz.