Context - The Earth's climate has changed over the last century and by 2001 there was strong evidence that most of the warming observed the previous 50 years was attributable to human activities.

Moreover, computer models already predicted that temperatures would continue to rise over the 21st century.

This was revealed by the Third Assessment Report of the Intergovernmental Panel on Climate Change (IPCC) which involved many hundreds of scientists from many countries.

What was known in 2001 about climate change and its consequences?