Some very small organisms can produce global effects, such as the tiny crustaceans that stir the oceans every night. What would the oceans be like without life? If minerals, gases and nutrients had to mix by diffusion, the process would be very slow. Wind and currents could help somewhat. Now, Houghton et al., publishing in […]
City planners need to plant more trees in urban areas, but the benefits go beyond beautifying pavement. Urban areas occupy 4% of the land surface of the planet, says Theodore A. Endreny in a Comment article in Nature Communications. That may strike readers as surprising, given most people’s attention to cities for work, travel and […]