Global Experts

Welcome to our Global Experts! These pages provide detailed information about global climate change. We hope you'll gain a good understanding of how our earth's climate is changing and how human activities are influencing these changes!

• What are Greenhouse Gases?
  Sources, atmospheric concentration, and their effect on the atmosphere.
• What is the Carbon Cycle?
  Sources of carbon, where it goes, historical changes in atmospheric concentration, and how carbon is linked to global climate change.
• Exploring Clues to Our Past
  How earth's environmental history can be determined by examining written records, tree rings, ice cores, coral reef cores, and various types of sediments.