Drawing on improved paleoclimate records and current global observations has prompted the authors to reach new conclusions about what constitutes a safe level of CO2.

CNN: Carbon dioxide levels already a danger

The improved battery systems rely on a new steel enclosure system, Boeing said in a statement on Friday, designed to keep any level of battery overheating from affecting the airplane or even being noticed by passengers.

FORBES: Move up http://i.forbesimg.com t Move down