President Xi Jinping said China firmly supports France in hosting the upcoming climate change summit, when he met with visiting French President Francois Hollande in Beijing on Nov 2, 2015. [Photo/China Daily]

For the nearly nine years that I have been Secretary-General, I have travelled the world to the front-lines of climate change, and I have spoken repeatedly with world leaders, business people and citizens about the need for an urgent global response.

Why do I care so much about this issue?

First, like any grandfather, I want my grandchildren to enjoy the beauty and bounty of a healthy planet. And like any human being, it grieves me to see that floods, droughts and fires are getting worse, that island nations will disappear and uncounted species will become extinct.

As His Holiness Pope Francis and other faith leaders have reminded us, we have a moral responsibility to act in solidarity with the poor and most vulnerable who have done least to cause climate change and will suffer first and worst from its effects.

Second, as the head of the United Nations, I have prioritized climate change because no country can meet this challenge alone. Climate change carries no passport; emissions released anywhere contribute to the problem everywhere. It is a threat to lives and livelihoods everywhere. Economic stability and the security of nations are under threat. Only through the United Nations can we respond collectively to this quintessentially global issue.

The negotiation process has been slow and cumbersome. But we are seeing results. In response to the UN's call, more than 166 countries, which collectively account for more than 90 per cent of emissions, have now submitted national climate plans with targets. If successfully implemented, these national plans bend the emissions curve down to a projected global temperature rise of approximately 3 degrees Celsius by the end of the century.

This is significant progress. But it is still not enough. The challenge now is to move much further and faster to reduce global emissions so we can keep global temperature rise to below 2 degrees Celsius. At the same time, we must support countries to adapt to the inevitable consequences that are already upon us.

The sooner we act, the greater the benefits for all: increased stability and security; stronger, more sustainable economic growth; enhanced resilience to shocks; cleaner air and water; improved health.

We will not get there overnight. The climate change conference in Paris is not the end point. It must mark the floor, not the ceiling of our ambition. It must be the turning point towards a low-emission, climate-resilient future.

Around the world, momentum is building. Cities, businesses and investors, faith leaders and citizens are acting to reduce emissions and build resilience. The responsibility now rests with Governments to conclude a meaningful, binding agreement in Paris that provides clear rules of the road for strengthening global ambition. For this, negotiators need clear guidance from the top.

I believe this is forthcoming. The leaders of the G20, who met earlier this month in Antalya, Turkey, showed strong commitment to climate action. And more than 120 Heads of State and Government have confirmed their participation in Paris, despite heightened security concerns in the wake of the terrorist attacks.