Nasa launches carbon dioxide observer
Nasa has launched a mission dedicated to measuring carbon dioxide (CO2) from space.
The Orbiting Carbon Observatory-2 (OCO-2) will help pinpoint the key locations on the Earth's surface where the gas is being emitted and absorbed.
A Delta rocket carrying the satellite lifted clear of the Vandenberg Air Force Base in California at 02:56 local time (09:56 GMT; 10:56 BST).
The ride to orbit is expected to take just under the hour.
- From the section US & Canada