If we’re to win the climate struggle, we must remain in Europe | Caroline Lucas and John Ashton

Our security and prosperity depend on a successful response to climate change, the most urgent challenge of our time. So does any prospect of a transition to a way of living together that is just and sustainable. And if we fail on climate, we lose the very capacity to shape our destiny that makes sovereignty worth having.

Related: David Cameron on the prospect of Brexit: ‘Leave want to take the country backwards’

We can win our democracy back. But to win it we must work with democratic forces across Europe