The concrete jungles of the world’s cities are massive sources of carbon dioxide (CO2) emissions, due in part to their construction. But now some architects are reverting back to one of the oldest forms of building material which is cheaper, faster and more sustainable. Al Jazeera’s Nick Clark reports from Zillertal in Austria. – Subscribe to our channel: http://aje.io/AJSubscribe – Follow us on Twitter: https://twitter.com/AJEnglish – Find us on Facebook: https://www.facebook.com/aljazeera – Check our website: http://www.aljazeera.com/

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