Nearly 120 world leaders gathered in Glasgow to address what scientists and health experts say is the world's biggest crisis: climate change. CNN's Wolf Blitzer reports. | CNN

Governments around the world have just 11 years to make "rapid, far-reaching and unprecedented changes in all aspects of society" to avoid disastrous levels of global warming, according to a stark new report from the global scientific authority on climate change. https://cnn.it/2E9SYWW | CNN Replay