Remember this number for the rest of your life.

Recommended Readings and Websites:

Two Articles from Yale Global Online

James Hansen: Clock running out I
Bo Ekman: Clock running II

The Science: 

Dr James Hansen:
    Research Papers and Occasional Writings
    NASA Publications

The best climate discussion online:
Real Climate

Coming: A Q&A on 350 in 25 languages:
European Environment Agency

Earth Systems Science:
Stockholm Environment Institute



Climate Change Overviews and Focus Knowledge

An outstanding primer and climate news:
New Scientist Climate Special

Bi-weekly updates on the Arctic summer meltdown:
Arctic Sea-Ice Extent

The current CO2 level from observation sites around the world:
Trends in Atmospheric Carbon Dioxide


The Climate Treaty

The background and work in progress:
United Nations Framework Convention on Climate Change


The Movement:

An excellent Q&A on 350 ppm:
350.org