Let's be perfectly honest, in a money-obsessed city like HK, can there be ANY other reason for business to adopt cleaner technologies?
Take the three examples cited by Jared Diamond in his editorial this week for the IHT -- Walmart, Coke, and Chevron. Main point: being environmental isn't just good PR, but a more efficient way to utilize and extract the dwindling natural resources which are indispensable product and manufacturing inputs.
http://www.nytimes.com/2009/12/06/opinion/06diamond.html?_r=1&scp=1&sq=jared%20diamond&st=cse
In short, as the precious natural resources dry up, literally, green business will become the ONLY way to do business in the medium and long term.
It's only once the HK Government internalizes this philosophy that we will see tighter controls imposed on emissions. In this city, the tail wags the dog: in other words, BUSINESS MUST LEAD THE WAY. It's only then that the Government will take heart and follow.