It appears that CO2 ppm is approximately 390. 350.org has asserted that safety per humans is contingent on 350 ppm. What are we to make of this? And what will happen to us between 390 ppm and 350 ppm?

To the previous poster, it means we are already over the line and any further CO2 saturation is a bonus, as will be the climate catastrophes that additional warming will bring.

We not only have to curtail growth in CO2 pollution, we have to turn back the clock and reduce already toxic levels. This will be even more difficult than promising to cut in the future, but just as crucial.

350 ppm CO2 is the upper limit - a "safer" range (if we agree that stopping runaway positive feedback loops of warming is "safe" for life on earth) would be closer to 300ppm. The Climate Code Red website has some great articles and videos explaining the consequences of the different levels - http://www.climatecodered.net/.

none of the goals suggested by science are politically acceptable so we will be forced to directly confront the industries, governments, economies, and individuals responsible for the climate catastrophe (that means changing our own lives, too, of course) in order to halt emissions.

things should get interesting in Pittsburg... http://3riversconvergence.org/