"Once you have an abrupt event like this - the ground cracks and opens up - it's not something that can just be undone by a cold year, because you've already exposed all this ground. Some of the material is just falling into lakes. You're losing ground material and you just can't go back in a human relevant timeframe." - Sue Natali This week on Living Lab Radio: Climate scientist Sue Natali has just returned from the Alaskan Arctic, where she witnessed extreme heat, wildfires, lightning storms,