• Earth’s climate varies naturally – because of a variety of cosmological and geological processes.
• “Climate change” refers to an additional, and relatively rapid, change induced by human actions.
• The additional change – several degrees C within a century – will disrupt the foundations of life on Earth.
• Ecosystems and life in general have evolved within a narrow band of climatic-environmental conditions.
GHG: Coming Decades
The International Energy Agency predicts that the increase in greenhouse more...