Climate Change, climate change, greenhouse gas emissions
Q&A: Climate Change

The Earth's climate has always varied, so the term climate change is now generally used to describe the changes caused by human activity - specifically, greenhouse emissions such as carbon dioxide and methane, which build up in the atmosphere and trap heat.

What is climate change and why should we be concerned about it? David Adam explains

Added by View user profileKasem Ali on July 12, 2009