I am delighted to join you this evening and to see so many familiar faces.
This is the fifth Conference of Parties that I have attended, beginning with Bali in my first year as Secretary-General.
In that time we have seen important progress.
But as we all know, a great deal remains to be done to put the world on a safer, more sustainable path.
There is something different about this COP.
It is the first since the global population topped seven billion.
We have reached a new milestone as a human family.