Ki-moon for example said the following:
"Climate change threatens current and future generations.
We need look no further than last week’s catastrophe in the Philippines. I extend my deepest condolences to those affected and families and victims of Typhoon Haiyan.
All around the world, people now face and fear the wrath of a warming planet."
He also mentined that Iceland could be without ice soon:
"Earlier this year, I visited Iceland, where the rate at which the glaciers are melting is among the fastest in the world. I was told if we do not take [an] urgent action now Iceland may be a land without ice soon."
And he concluded with:
"I count on your strong engagement, support and leadership. Let us work together, ladies and gentlemen, to make this world better for all. Let us shape this future, our own future for all succeeding generations and environmentally sustainable planet Earth."