How far into the future should we be planning when it comes to the environment? 20 years? 100 years? These are vital questions with which scientists, politicians and futurists are grappling, as our icecaps melt and our seas rise. This week on Sea Change Radio, we delve into the moral dilemma policymakers face today with Daniel Kirk-Davidoff, Assistant Professor of Atmospheric and Oceanic Science at the University of Maryland. The starting point for our conversation is a soon-to-be-published paper comparing the timescale of methane versus CO2 emissions. We touch upon the science of these two greenhouse gasses, examine how long-term environmental planning and short-term planning might conflict, and try to better understand what 100 years really means.