By Ban Ki-moon
Secretary-General of the United Nations
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;
