Marika Holland says "It's a strong suggestion that reducing emissions of greenhouse gases, fossil fuel burning can have an impact on Arctic sea ice cover."
Stuart Butchart said that, since 2002, the risk of species extinction has actually increased, not decreased, and the need to increase the scale of our efforts.
He's is working on more sensitive seismometers using fiber optics. The information that scientists gather helps them create pictures of what's inside the Earth.