As the United Nations climate negotiations in Lima, Peru, entered their second and final week, some progress – and thus some optimism — was claimed late Monday, Dec. 8. They were small steps. And because huge leaps seem impossible in grappling with this global crisis, even small steps take on growing importance. A big reason for the optimism is the incredible advances in scientific monitoring of carbon stocks and greenhouse gas emissions that simply didn’t exist a few years ago. It’s giving countries confidence to engage in this process. I explain why in this story on National Georgraphic online.