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View of the Villa 31 shantytown with the upscale Recoleta neighborhood in the background in Buenos Aires, Argentina.

The low-income neighborhood Villa 31 (foreground) in Buenos Aires. The city's less prosperous neighborhoods are more exposed to urban heat than wealthy districts. Credit: Eitan Abramovich/AFP/Getty

Environmental sciences

Simmering inequity: a city’s worst heat hits low-income residents

The burden of the ‘urban heat-island’ effect falls most heavily on economically disadvantaged neighborhoods.

The brunt of a city’s heat is often borne by residents of low-income neighbourhoods, according to an analysis of large urban areas around the world.

The bustle and buildings in a city generally make it hotter than the surrounding countryside. To investigate the impact of this ‘urban heat-island’ effect, Angel Hsu at Yale-NUS College in Singapore and her colleagues studied satellite and census data for 25 cities on 5 continents.

In 18 of those cities, the burden of urban heat fell more heavily on less affluent neighbourhoods than on richer districts. The cities with this disproportionate burden ranged from Berlin to Buenos Aires.

The analysis also found that neighbourhoods where plant life is sparse tended to be warmer than districts with lush vegetation. Adding green spaces to lower income areas could help to relieve this inequality, the authors say.

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Astronomy and astrophysics

X-rays expose a clue to the mystery of the missing neutron star

Astronomers might have spotted the long-sought debris of a famous stellar explosion.
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A bone fragment excavated in Southeast Alaska belonged to one of the earliest known domestic dogs in the Americas. Credit: Douglas Levere/University at Buffalo

Genomics

An ancient Alaskan dog’s DNA hints at an epic shared journey

To scientists’ surprise, a 10,000-year-old bone found in an Alaskan cave belonged to a domestic dog — one of the earliest known from the Americas.
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Black carbon emitted by power plants and other sources in Asia wafts to the Arctic, where the pollution accelerates the melting of ice and snow. Credit: Kuni Takahashi/Bloomberg/Getty

Atmospheric science

Soot from Asia travels express on a highway to the high Arctic

Black carbon from fuel combustion in South Asia bolsters the effects of climate change on northern ice and snow.
Prevotella copri bacteria, computer illustration

The gut bacterium Prevotella copri (artist’s impression) has been linked to a reduction in the health benefits of a diet that skimps on red meat in favour of fish and vegetables. Credit: Kateryna Kon/Science Photo Library

Microbiology

Trying a Mediterranean diet? Gut microbes might sway the outcome

The composition of a person’s microbiome could influence the health effects of swapping steak for vegetables and olive oil.
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