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S5 E4 - Valparaiso suffered greatly with the opening of the Panama Canal, but in recent years it has experienced an urban renewal, a liveliness that can be felt all over the city.
Climate Wars
E3 - Despite fears of "peak oil", Professor Iain Stewart discovers that huge technological advances are helping extend the life of existing oilfields, and new unconventional oil and gas supplies like shale gas and tar sands are extending the hydrocarbon age well into the 21st century.
The Grass Kingdom
E5 - The vast, quiet plains of the Canadian prairies are home to some of the most productive ecosystems in North America thanks to a seemingly insignificant organsim - grass!