Comments on ‘solar,volcanic and CO2 forcing of recent climatic changes’

The various limitations of a recent analysis of climatic variations in terms of solar volcanic and carbon dioxide forcing have been examined in more detail. In particular, the possibility of additional CO₂ release from forest clearing greatly increases the very large statistical uncertainties in the original analysis. While the inclusion of the various forcing terms is a highly desirable approach, the uncertainties in the data used mean that it is not appropriate to suggest that the surface warming due to the greenhouse effect has now been roughly determined.