During May 2013, for the first time, NOAA's Mauna Loa observatory recorded an average
daily CO2 concentration above 400 parts per million. This is indeed a sobering
milestone.
The Keeling Curve:
Scientists almost unanimously agree that human activity is to blame for climate change
http://www.globalpost.com/dispatch/news/science/130516/unanimity-among-scientists-over-cause-climate-change-study
Bill McKibben, co-founder of 350.org:
"We're
in new territory for human beings--it's been millions of years since
there's been this much carbon in the atmosphere. The only question now
is whether the relentless rise in carbon can be matched by a relentless
rise in the activism necessary to stop it."
Dr. James Hansen, former NASA Climatologist:
"If
humanity wishes to preserve a planet similar to that on which
civilization developed and to which life on Earth is adapted,
paleoclimate evidence and ongoing climate change suggest that CO2 will
need to be reduced ... to at most 350 ppm."
"We've got work to do, and there's not a moment to lose."
"We've got work to do, and there's not a moment to lose."
