The carbon footprint of the Olympic Games remains substantial, despite reforms by the International Olympic Committee. A new study by the University of Lausanne shows that the Olympic model needs further reform to comply with the Paris Agreement and outlines possible courses of action.

The Mediterranean Sea is rapidly changing under ongoing climate change. In the eastern basin, tropicalization is already well documented and driven by a combination of strong warming and the influx of tropical species through the Suez Canal. In contrast, the western Mediterranean has, until now, shown fewer such signals. However, a recent study demonstrates that the expansion of microscopic warm-water species provides a clear and early indication of tropicalization impacts on marine ecosystems.

To lower agricultural emissions, policymakers and communities first need to pinpoint the sources. Not just by country but crop by crop, field by field. In a Cornell Unviersity study published Feb. 13 in Nature Climate Change, researchers have synthesized data from multiple ground sources and models to map global cropland emissions at high resolution – down to about 10 kilometers – while breaking down emissions by crop and source and identifying regions for more precise mitigation.