A report last week in the prestigious scientific journal Nature revealed that the hole in the ozone layer over the Arctic was the largest ever recorded—comparable for the first time to the man-induced hole that appears every year in the ozone layer over the Antarctic. But when reporters asked Canadian scientist  David Tarasick, who was involved in the study, to explain its findings, Environment Canada refused to let him speak. [caption id="attachment_8689" align="alignright" width="150" caption="David Tarasick, muzzled by Environment Canada"][/caption] Environment Canada scientist David Tarasick, whose team played a key role in the report published Sunday in the journal Nature, is not being...