400 Parts Per Million

27 May

“The level of the most important heat-trapping gas in the atmosphere, carbon dioxide, has passed a long-feared milestone, scientists reported Friday, reaching a concentration not seen on the earth for millions of years.

“Scientific instruments showed that the gas had reached an average daily level above 400 parts per million — just an odometer moment in one sense, but also a sobering reminder that decades of efforts to bring human-produced emissions under control are faltering.

“The best available evidence suggests the amount of the gas in the air has not been this high for at least three million years, before humans evolved, and scientists believe the rise portends large changes in the climate and the level of the sea.

“’It symbolizes that so far we have failed miserably in tackling this problem,’ said Pieter P. Tans, who runs the monitoring program at the National Oceanic and Atmospheric Administration that reported the new reading.” – Excerpts from NY Times, May 10, http://www.nytimes.com/2013/05/11/science/earth/carbon-dioxide-level-passes-long-feared-milestone.html?pagewanted=all

“Climate change is the single biggest environmental and humanitarian crisis of our time. The Earth’s atmosphere is overloaded with heat-trapping carbon dioxide, which threatens large-scale disruptions in climate with disastrous consequences. We must act now to spur the adoption of cleaner energy sources at home and abroad. Climate change is the single biggest environmental and humanitarian crisis of our time. The Earth’s atmosphere is overloaded with heat-trapping carbon dioxide, which threatens large-scale disruptions in climate with disastrous consequences. We must act now to spur the adoption of cleaner energy sources at home and abroad. Climate change is the single biggest environmental and humanitarian crisis of our time. The Earth’s atmosphere is overloaded with heat-trapping carbon dioxide, which threatens large-scale disruptions in climate with disastrous consequences. We must act now to spur the adoption of cleaner energy sources at home and abroad.Climate change is the single biggest environmental and humanitarian crisis of our time. The Earth’s atmosphere is overloaded with heat-trapping carbon dioxide, which threatens large-scale disruptions in climate with disastrous consequences. We must act now to spur the adoption of cleaner energy sources at home and abroad.”  – Natural Resources Defense Council, http://www.nrdc.org/globalwarming/

Relevant Websites

A leading organization addressing climate change is 350 with its website http://350.org/

Understanding 350 – frequently asked questions, http://350.org/en/understanding-350#1

What to do about 400 ppm, http://400.350.org/

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