Canwest News Service: Climate change will so dramatically impact Earth’s atmosphere that there could be a 20 per cent increase in the amount of harmful ultraviolet radiation hitting some parts of the planet, scientists are warning. As temperatures climb in coming decades, there will be marked changes in the circulation of the upper atmosphere and distribution of the ozone protecting Earth from the sun’s potent ultraviolet radiation, University of Toronto researchers Theodore Shepherd and Michaela Hegglin …