The attention being drawn to building energy efficiency was " self-evident," as 89 percent of the energy consumption in Hong Kong came from buildings, Yau said.
Hong Kong has been making efforts to go green. It is now firmly committed to reducing its energy intensity by 25 percent by 2030 compared with 2005.
Yau said the new building energy efficiency measures, together with money already assigned for upgrading government buildings, were expected to generate over 1.5 billion HK dollars (192.3 million U.S. dollars) worth of business opportunities in Hong Kong.
Liu Yanhua, vice minister of science and technology of China, also said enterprises have a vital role to play in raising energy efficiency and reducing greenhouse gas emission, and should make use of the huge potentials and business opportunities.
The trend for the world to move towards low carbon economy has been ever more obvious, Liu said.
Zhang Yue, chairman and chief executive of Broad Air Conditioning, China, also cited a United Nations demonstrative project to say that the potential to improve building energy efficiency was huge using currently available technologies and financing.
It costs little, or even more than pays off to improve building energy by using simple measures like using shades outside, instead of inside, the windows, he said.
The energy consumption was reduced by some 80 percent for the demonstrative project, said Zhang, who has also been known for promoting environmental causes.
The Second International Conference on Climate Change was jointly organized by the Climate Group and the Hong Kong Climate Change Forum, both non-governmental.