Time is of the essence at Cancun

Alejandro Garcia and many of his friends work as volunteers at the Moon Palace, the main venue for the ongoing United Nations Climate Change Conference.

"I don't know how much progress they're making," Garcia, a 22-year-old student at Anahuac University in Cancun, admitted.

"But I know the conference is good for the people of the world. It will keep the planet healthy and livable for our children," he said.