International Journal of Modern Physics: 90% of Global Warming May Result From Natural Causes
'Using advanced statistical techniques, Ludecke et al. concluded that global temperature variation has causes related to both anthropogenic and natural reasons. Depending on a given climate station's temperature measurements, the warming (cooling) trend is likely to be explained, from 40 to 90%, by natural causes. (The remaining anthropogenic causes of temperature change may be a result of greenhouse gases, UHI, land-use, aerosols and etc.)'