Just how sensitive is Earth's climate to increasing concentrations of carbon dioxide?
Slower warming than predicted gives the world time to develop better energy technologies
Politics intrudes as a Republican congressman investigates NOAA climate scientists
American commitments to reduce greenhouse gas emissions are encouraging other nations
Energy from wind, water and sun would eliminate nuclear and fossil fuels
After decades of slow progress and massive investment, some fusion power researchers are changing tactics
Black isn't the new green
Pets and people shed clouds of microbes as unique and personal as their fingerprints, but the clouds can change over time.