Vladimir Putin's horrendous war in Ukraine has revealed just how united and decisive we can be in the face of a crisis. Europe has once again flung open its doors to refugees fleeing destruction. Rousing gestures of humanity are seen every day. And this is despite the enormous economic costs — energy bills are surging, public money is pouring into Ukraine, sanctions are biting here as well as Russia. But it's the right thing to do and we know it. So why can't we do the same when faced with crises that threaten the existence of everyone on the planet?...