Two temperature readings register ominous new potential measurements of accelerating climate changeThe 20th anniversary of the discovery of the first “hole” in the ozone layer on Tuesday had many climate observers focused on the Arctic, where a study published last week found that polar bears were eating more birds’ eggs, perhaps due to lost hunting grounds with the disappearance of summer ice.But equally significant climate news was playing out in Antarctica, where two climate stations registered ominous new potential measurements of accelerating climate change.