Test your knowledge of Xmas excess

January 21, 2013 -- Updated 0230 GMT (1030 HKT)

Patricia Wu looks at efforts to combat food waste in Hong Kong.

January 14, 2013 -- Updated 0233 GMT (1033 HKT)

CNN's Pauline Chiou goes to Hong Kong's annual toy fair to find out about the growing market for eco-friendly toys.

December 31, 2012 -- Updated 0415 GMT (1215 HKT)

CNN's Liz Neisloss reports on a roof that is only a sample of the greening of Singapore's skyline.

December 19, 2012 -- Updated 0216 GMT (1016 HKT)

A dam project in Cambodia could destroy livelihoods and ecosystems, says Conservation International

December 18, 2012 -- Updated 0322 GMT (1122 HKT)

Shipping lines, port authorities and technology companies are taking the initiative to go green and reduce costs.

December 10, 2012 -- Updated 0206 GMT (1006 HKT)

Less than 20 miles from Singapore's skyscrapers is a completely different set of high-rise towers.

December 6, 2012 -- Updated 1104 GMT (1904 HKT)

The Pitcairn Islands might only have 55 human inhabitants, but the waters surrounding them are teeming with marine life.

December 3, 2012 -- Updated 0322 GMT (1122 HKT)

Biofuel made from sugar cane waste in Brazil could revolutionize the global energy industry.

November 26, 2012 -- Updated 0258 GMT (1058 HKT)

Many believe that fuel-cell cars will overtake electric vehicles in the near future.

November 19, 2012 -- Updated 0820 GMT (1620 HKT)

Modern and sustainable buildings in the UAE are taking cues from an ancient Arabic design tradition.

November 12, 2012 -- Updated 0409 GMT (1209 HKT)

One man's artistic vision is distracting divers from Cancun's threatened underwater ecosystem.

November 12, 2012 -- Updated 1746 GMT (0146 HKT)

Lake Victoria, Africa's largest lake, has been plagued by water hyacinth plants for over two decades.

Just how much are natural wonders like the Great Barrier Reef worth in monetary terms?