But he says understanding these differences can help discover how some complex processes on our own planet really work.

VOA: special.2009.12.30

Author,educator and environmental activist Bill McKibben offers some advice in his new book on how to live on what he calls our "tough new planet."

VOA: standard.2010.04.21

"The planet on which our civilization evolved no longer exists."

VOA: standard.2010.04.21

Writer-director Cameron also acknowledges that what the humans try to do on the fictional Pandora is a clear metaphor for what he believes are the dangers of exploitation on our own planet;

VOA: standard.2009.12.19

"The bulk of our food production on this planet is dependent to some extent or another on oil or products of oil, so this goes right to the heart of,frankly, the way our society functions,"

VOA: standard.2009.10.20