Canadian Press: People seeking to escape summer’s humidity and learn something in the bargain would do well to check out “The Last Continent,” a breathtaking documentary chronicling a group of Quebec explorers venturing into the Antarctic. You can’t help but feel a little chill with all the stunning footage of the frozen tundra in the film, which shows the crew of the Sedna IV sailing ship documenting the effects of climate change during a year. “The Last Continent” has already proven to be a …