To enhance learning about global issues, we select an issue of global concern that becomes the subject of intensive study, philanthropy and action. The 2008 Global Relief Issue is climate change. What do you think is the main cause of climate change? Human activity 45% 77 votes Natural geological forces 4% 6 votes Both A and B 46% 79 votes None of the above 5% 9 votes Total: 171 votes Click to close window