Summary:
A new series of special programming on CNN International will focus on the Arctic and ""green pioneers"" who are using innovative ways to tackle the world's environmental challenges.

Full article:
(CNN) -- CNN International's "Going Green" is back for another series of special programming with "Extreme Science," a special one-hour documentary that will take viewers on a journey where scientists study global warming in one of the coldest places on earth. Airing July 16 and 17 and hosted by special correspondent, environmentalist and explorer Philippe Cousteau, the documentary will showcase his journey to the Arctic and the significance of the science studied in the extreme conditions. "Extreme Science" will be followed by "Going Green: Green Pioneers," the second installment of this year's green weeks, starting July 18, 2011. The week of special in-depth reports looks at the world's pioneers who are working to make a difference at the front lines of our world's environmental challenges. The series culminates with "Green Pioneers," a half-hour program hosted by Philippe Cousteau. "Green Pioneers" focuses on the people who are using innovative ways to tackle today's environmental challenges. Watch on CNN International: . Extreme Science . Saturday, 16 July: 4pm ET Sunday, 17 July: 5am ET Saturday, 30 July: 9am, 4pm ET Sunday, 31 July: 5am ET . Going Green: Green Pioneers . Saturday, 23 July: 9am, 4pm ET Sunday, 24 July: 5am ET Tuesday, 26 July: 630am, 130pm ET .