New York Times: I had a Skype chat Wednesday about Siberian permafrost in the context of climate change with Marina Leibman, a top Russian permafrost expert who had just returned from examining the unusual crater spotted on the Yamal Peninsula in Siberia late last week. We talked just before fresh reports circulated about reindeer herders finding another such hole in the region. I hope youll watch our chat, which I regret I have not yet had time to transcribe (if you are in the mood, Id be grateful for help;...