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lsanderson
KEEPING WATCH The Mauna Loa Observatory, at an altitude of 11,135 feet above sea level in Hawaii, has been continuously monitoring and collecting data related to climate change since the 1950s. More Photos »
By JUSTIN GILLIS
Published: December 21, 2010
MAUNA LOA OBSERVATORY, Hawaii — Two gray machines sit inside a pair of utilitarian buildings here, sniffing the fresh breezes that blow across thousands of miles of ocean.
They make no noise. But once an hour, they spit out a number, and for decades, it has been rising relentlessly. More
