The study found that climate conditions alone could not explain the amount of tree cover in different areas.

VOA: special.2009.09.01

She says different countries need different solutions based on location,environment, climate and population needs.

VOA: special.2009.07.28

"Never in the 17 years of climate change negotiations have so many different nations made so many firm pledges together,".

VOA: standard.2009.12.06

Since that time McKibben has written a dozen books that address climate change from many different angles.

VOA: standard.2010.04.21