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Catalyst: Why plants are good for liveable cities

Central Park in Sydney was voted the world's best tall building. It is known for the plants in its beautiful vertical gardens which cover its surfaces, but did you know that the garden is not purely decorative? Watch this video to find out what other purpose the vertical garden has.

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Catalyst: What is a mega-region?

Population growth is one of the problems facing Australians cities. Dr Julian Bolleter from the Urban Design Research Centre at the University of Western Australia says creating mega-regions could be a potential solution. What is a mega-region? In order to create a mega-region, what must happen first?

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Pocket Compass, Ep 5: An immigration nation

Prime Minister Malcolm Turnbull once described Australia as an 'immigration nation'. What do you think he meant by that? Do you agree? |Watch four very different people speak about their experiences as first- and second-generation migrants. What were some reasons they or their parents migrated to Australia?

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Foreign Correspondent: Mesoamerican Reef threatened

The Mesoamerican Reef, just off the shore of Mexico's Yucatán Peninsula, is under major threat. Listen to oceanographer Roberto Iglesias-Prieto explain how untreated wastewater affects the underground river system and the reef.

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Foreign Correspondent: Prehistoric evidence

Beneath the Yucatán Peninsula in south-eastern Mexico exists a karst aquifer, the largest underground river system in the world. Discover its deep caverns, which have been perfectly preserved for thousands of years, complete with prehistoric remains.

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ABC News: Australians as global citizens

How is Australia connected globally? Watch as presenter Jeremy Fernandez uses a range of data sources to describe Australia's position in the world. From the economy to immigration, this clip shows some of the ways Australia currently connects with the world.