It's also about preserving a sense of home sweet home--or at least creating a healthy diversion, preferably something that doesn't involve yet more time in front of the computer screen.

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By converting a five-storey "tong lau" -- an old Chinese building -- with solar panels, a turfed roof and energy efficient appliances, Khan also is keen to emphasize that his eco-friendly flat is as much about preserving the old and a sense of heritage as it is about being green.

CNN: Can Hong Kong build bigger, higher, greener?