All C40 member cities have been invited to participate in the C40 Hong Kong workshop on November 5 and 6, Secretary for the Environment Edward Yau says.

It is jointly organised by the Environmental Campaign Committee and Civic Exchange with the Environment Bureau's support. Mr Yau told lawmakers today a steering committee has been formed to oversee the preparation work.

Reiterating Hong Kong will follow the national target to cut carbon intensity by 40%- 45% by 2020, he said a consultant will conduct additional modelling work and analysis.

The consultancy recommendations on Hong Kong's action blueprint for dealing with climate change will be made public upon completion of the analysis, Mr Yau noted.

On greenhouse gas emissions, he said the Government considers it inappropriate to legislate and stipulate emissions for the two power companies at this stage, as tightening their carbon emissions can only be achieved by changing the fuel mix.

"Changing the fuel mix for power generation involves important and complicated issues such as energy policy and security, stability in power supply and electricity tariff. It requires wider and more in-depth studies and assessments," he said.