Hong Kong holiday decorations go green with energy-efficient LED lights.

Climate change debate

CNN's Christine Romans has a look at companies spending money on climate change.

What is carbon trading?

Carbon trading, a mechanism to tackle global warming, is high on the Copenhagen agenda.

Struggling with climate change

Fluctuating temperatures and erratic weather are cause havoc in Grenada.

Sweden's 'green' city

CNN's Jim Boulden reports on a Swedish city that has cut emissions, while keeping its economy growing.

Rising temperatures could be devastating for glaciers surrounding the Himalayas.