When we first confirmed the existence of microbes in subglacial environments at Arolla, we started to think about how these microbial populations might be sustained at glacier beds – and about whether microbes might also be found in supraglacial and englacial settings and how the challenges to life in those environments might differ from those that would be encountered at the glacier bed. The work subsequently done in my group in Alberta by Mark Skidmore and Maya Bhatia was directed at some of these issues, but there was much that had not been touched. Thinking that oxidation of organic matter...

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