A recent study, published in Nature, reports on how anonymized data from three quarter of a million global smart phones was used to detect and map physical inactivity around the world. The study is an outstanding example of the type of scientific analyses that is possible using human beings as sensors.
A new analysis of Antarctic ice cores shows that at the beginning of the last deglaciation, the start of rising CO2 lagged rising temperature by about 800 years which is consistent with the Southern Hemisphere playing a dominant role in the rise in atmospheric CO2. The concomitant rise in methane appears to be governed by Northern Hemisphere processes.
Air bubbles in Greenland ice cores are analyzed to compare changes in Greenland surface temperature and atmospheric methane concentration during a rapid warming event lasting 200 years during the last deglaciation. It is found that changes in Greenland surface temperature and atmospheric methane emissions occurred essentially synchronously indicating that this warming event included the tropics.
Oxygen is fundamental to oceanic biological processes and its decline can cause major changes in ocean productivity and biodiversity. Over the past 50 years low oxygen zones in the open oceans have expanded by an area equivalent to half the size of Canada and hundreds of coastal sites now have low oxygen concentrations that limit the distribution and abundance of animal populations.