Guardian: Banking crisis, recession, stocks tumbling, house prices collapsing – it’s been a deluge in the past few weeks to compare with any turbulence of previous decades. It’s easy, as a result, to be gloomy about the prospects. Recession, after all, is already here and everyone is worried about the immediate future. There’s also a lot of talk that switching the world economy to a carbon-free future is now something that cannot be afforded. Not so. There were three important events in …