Please download the updated pdf of "Ozone and climate at the crossroads" HERE.

The following corrections have been made:

In chapter two (pp. 6-14) of the previous version, the data from the Special Report on Emissions Scenarios (SRES) was mistakenly presented and used in calculation as being in MTCO2 , instead of MTC. The main impact of this is found in tables 2 and 3 and graph 2, which show an illustration of how much future emissions predicted by the various models would look as a percentage of a 550pmv stabilisation scenario, drawn from the SRES. Because the model figures were in CO2 and the SRES in C, but mistakenly interpreted as CO2, the percentages were compared to an incorrectly low number (CO2 would be 44/12ths as much as C alone). This meant the percentages were incorrectly high.

In the recalculation, all of these percentages shift down by the ratio of C to CO2, 12/44ths. The figure for the share of HFCs from the SRES B1 scenario, which was posited as the most "sustainable" option because the emmissions trajectory leads to a 550 ppmV stabilization, also shifts down by 12/44ths.

In making the corrections we also did a recalculation of the figures in Table 3 to account for improved estimation of HFC numbers, which had to be separated from a composite of HFC, PFC and SF6 in the 1995 Kroeze report.

This explains why, even after correcting the C/CO2 error, the figure of 27% isn't 12/44ths of the 76.7% from the previous version.

The changes were made in chapter two, and are reflected in the abstract.

For any further questions on this report, please email Jason Anderson

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