Just a quick note as to where we stand.

By: hcubed , 11:52 PM GMT on September 30, 2012

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For those who hang on to every word that comes out of the CAGW crowd, I've decided to let the rest of the world know just where we stand.

42.41 parts per million.

That number represents the amount of Global CO2 that we are above the level that scientists say is the upper safe limit for humanity.

Well, at least one scientist has said that here - and that was from James Hansen: "...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 from its current 385 ppm to at most 350 ppm..."

He said that in 2007 (and mentions we were, at that time, about 35 parts per million above the upper safe limit for humanity). In the past five years, then, we've risen another 7.41 parts per million beyond that upper safe limit for humanity.

So how long have we been above that deadly 350 parts per million, that upper safe limit for humanity?



Since about 1987.

So for about the last 25 years, we've been above that upper safe limit for humanity, and (since then) we've risen at about 0.136964 parts per million per year (42.41 parts per million divided by 25 years).

Oh, and to put it in a little context, if you look at that chart, you'll see a little yearly cycle.

Every year, the CO2 fluctuates about 6.3 parts per million (on an annual cycle with the highest in May and the lowest values in October).

And man adds 0.136964 parts per million per year to that variation.

So again, we're currently 42.41 parts per million above the upper safe limit for humanity.

Next year at this time, we'll probably be at 42.546964 parts per million above the above the upper safe limit for humanity (plus or minus 3.15 parts per million, depending on when in the yearly cycle we look.)

How long can we survive above that upper safe limit?

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About hcubed

Living in Biloxi MS, have been here since '85 (first Hurricane was Elena).