Six years ago, I was covering the unsuccessful United Nations climate summit held in Copenhagen, and I saw first-hand how China's image was tarnished, even though it had been making continual efforts to help achieve a global deal.

As countries have been drumming up their efforts to reach a deal on reducing greenhouse gas emissions in Paris in a few weeks, it is meaningful to take stock of how much better China has prepared itself in the years between the two sets of talks.

In my view, the past six years have seen China develop growing green awareness, improved institutional arrangements, better low-carbon commitments and active participation in cooperation with other countries. With such dramatic changes, China will be in a better position to help promote an agreement in Paris.