Earth: Art of the Changing World, Royal Academy

There was a time, not long ago in fact, when contemporary art could seem all too wrapped up in its own juvenile cleverness. It was all about being ironic and irreverent. Certainly a lot of it was achingly self-referential. But we eventually got fed up with all that. What’s more, we now live in less frivolous, more fearful times: recession has hit and the sea waters are rising, ready to flood us out and turn our congested cities into swampy, primitive marshland, like an apocalyptic J G Ballard...