A new study shows that some shark species may be able to cope with the rising salinity of Arctic waters that may come with rising temperatures. The Arctic is of special interest today because it is increasing in temperature at twice the global rate. According to researchers, past climate change in the Arctic can serve as a proxy to better understand our current climate change and aid future predictions. The Eocene epoch is like a "deep-time analogue for what's going to happen if we don't curb CO2 emissions today, and potentially what a runaway greenhouse effect looks like."...