claim: A key study published in the Journal of Climate this year by Bjorn Stevens of the Max Planck Institute for Meteorology in Hamburg, Germany, found that the cooling impact of sulfate emissions has held back global warming less than thought till now
evidence: International Council of Academies of Engineering and Technological Sciences ( CAETS ) in 2007, issued a Statement on Environment and Sustainable Growth : As reported by the Intergovernmental Panel on Climate Change ( IPCC ), most of the observed global warming since the mid-20th century is very likely due to human-produced emission of greenhouse gases and this warming will continue unabated if present anthropogenic emissions continue or, worse, expand without control.