Scientist Quotes and aphorisms about climate change M. S. Swaminathan Guy Ryder Bjorn Lomborg Heidi Hammel Heidi Hammel ,, It's very clear that global climate change is occurring on earth, but it's also been very clear tha... Mario J. Molina Mario J. Molina ,, Climate change and ozone depletion are two global issues that are different but have many connectio... David Suzuki Burton Richter James Hansen