Julia Rosen is a freelance journalist based in Portland, Oregon. She writes about earth and environmental science for Nature, Science, Orion, High Country News, the Los Angeles Times, Pacific Standard, and Nautilus, among other places. She is a contributor to Scientific American’s 60-Second Science podcast. Before she became a writer, Julia was a ski bum and a scientist who studied polar ice cores. Follow Julia on Twitter: @ScienceJulia.