An experiment to preserve the western swamp tortoise is the latest flash point in a debate over how far humans should go to protect nature as the world warms.
By 2008, the US and Canada mandated that all transoceanic vessels entering the Great Lakes manage ballast water discharges to prevent the spread of invasive species. Are the regulations working?
Invasive zebra mussels discovered in St. John River watershed in Quebec cbc.ca - get the latest breaking news, showbiz & celebrity photos, sport news & rumours, viral videos and top stories from cbc.ca Daily Mail and Mail on Sunday newspapers.