292 Improvement in municipal wastewater treatment alters lake nitrogen to phosphorus ratios in populated regions.
https://www.pnas.org/content/117/21/11566
291 Measurements in the CLOUD chamber at CERN show that the rapid condensation of ammonia and nitric acid vapours could be important for the formation and survival of new particles in wintertime urban conditions, contributing to urban smog.
https://www.nature.com/articles/s41586-020-2270-4
290 Fossil fuel combustion is driving indoor CO2 toward levels harmful to human cognition.
https://agupubs.onlinelibrary.wiley.com/doi/abs/10.1029/2019GH000237
289 Extreme rainfall triggered the 2018 rift eruption at Kīlauea Volcano.
https://www.nature.com/articles/s41586-020-2172-5
288 Global warming is causing megadrought in southwestern North America.
https://science.sciencemag.org/content/368/6488/314
287 Algal photophysiology drives darkening and melt of the Greenland Ice Sheet.
https://www.pnas.org/content/117/11/5694
286 Coastal wetlands reduce property damage during tropical cyclones.
https://www.pnas.org/content/117/11/5719
285 The Colorado River Basin is losing progressively more water to evaporation, owing to the disappearance of snow.
https://science.sciencemag.org/content/367/6483/1252
284 When smokers move out and non-smokers move in: residential thirdhand smoke pollution and exposure.
https://tobaccocontrol.bmj.com/content/20/1/e1.short
283 Bisphenol A and bisphenol S disruptions of the mouse placenta and potential effects on the placenta–brain axis.
https://www.pnas.org/content/117/9/4642
282 Global airborne sampling reveals a previously unobserved dimethyl sulfide oxidation mechanism in the marine atmosphere.
https://www.pnas.org/content/117/9/4505
281 Impacts of current and future large dams on the geographic range connectivity of freshwater fish worldwide.
https://www.pnas.org/content/117/7/3648
280 Shale gas development has limited effects on stream biology and geochemistry in a gradient-based, multiparameter study in Pennsylvania.
https://www.pnas.org/content/117/7/3670
279 Remarkable nucleation and growth of ultrafine particles from vehicular exhaust.
https://www.pnas.org/content/117/7/3427
278 Increasing aridity promotes sequential, systemic, and abrupt thresholds in drylands worldwide.
https://science.sciencemag.org/content/367/6479/787
277 Tropical snake diversity collapses after widespread amphibian loss.
https://science.sciencemag.org/content/367/6479/814
276 Invisible oil beyond the Deepwater Horizon satellite footprint.
https://advances.sciencemag.org/content/6/7/eaaw8863
275 Ocean sentinel albatrosses locate illegal vessels and provide the first estimate of the extent of nondeclared fishing.
https://www.pnas.org/content/117/6/3006
274 Declines in an abundant aquatic insect, the burrowing mayfly, across major North American waterways.
https://www.pnas.org/content/117/6/2987
273 Abundance of Floating Plastic Particles Is Increasing in the Western North Atlantic Ocean.
https://pubs.acs.org/doi/10.1021/acs.est.9b04812
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