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and many parts of antarctica relying solely on satellite data. which is late 1970s. and comparing, just the amount of environmental change. >> and they are incredibly strong group. working really well as a team. and people like to learn more and [ inaudible ] >> i've been following him on twitter. his last tweet is very short. he says, still waiting. people in minnesota will feel like they are in antarctica tomorrow. an arctic blast headed straight to them with wind chills in 40 to 70 below range. much of the northern u.s. is crippled by ice-related outages. meteorologists alexander steele shows us what to expect this