1 rich Libsyn https://www.libsyn.com 90 600 Digging — quite literally — into our planet’s past to study its paleoclimate has shed light on bygone ice ages and hints at trouble ahead for our now-warming planet. Knowable https://knowablemagazine.org <iframe title="Libsyn Player" style="border: none" src="//html5-player.libsyn.com/embed/episode/id/22447064/height/90/theme/custom/thumbnail/yes/direction/forward/render-playlist/no/custom-color/88AA3C/" height="90" width="600" scrolling="no" allowfullscreen webkitallowfullscreen mozallowfullscreen oallowfullscreen msallowfullscreen></iframe> https://assets.libsyn.com/secure/content/123189479