Asia News International: A new study has determined that the true extent of global warming can only be made when the smog of pollution has cleared from the skies. According to a report in New Scientist, the cleaner, clearer skies mean measurements of warming temperatures are not confused by smog. This is the reason why the current measurements of a 0.04 degC warming per year can be taken as the true signal of man-made global warming. As part of the study, a team led by Martin Wild, of the …