Tom Lehrer sang about poisoning them, but those pigeons in the park might be a good way to detect lead and other toxic compounds in cities. A new study of pigeons in New York City shows that levels of lead in the birds track with neighborhoods where children show high levels of lead exposure.

"Pigeons breathe the same air, walk the same sidewalks, and often eat the same food as we do. What if we could use them to monitor possible dangers to our health in the environment, like lead pollution?" said Rebecca Calisi, now an assistant professor in the Department of Neurobiology, Physiology and Behavior at the University of California, Davis, who conducted the study with undergraduate student Fayme Cai while at Barnard College, Columbia University. The work is published July 18 in the journal Chemosphere.

Decades after it was banned from paint and gasoline, lead pollution remains a significant concern. The New York City Department of Health and Mental Hygiene carries out routine screening of children in areas of the city identified as hot spots for lead contamination.

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In cooperation with colleagues of the University of Rostock, the University of Luxembourg, the Max Delbrueck Center for Molecular Medicine, the Karlsruhe Institute of Technology and the University of Eastern Finland, the Munich Scientists have now published the results in the journal PLOS ONE. In 2015 they already showed that exposure to particle emissions from heavy fuel oil (HFO) and diesel fuel (DF) adversely affects human lung cells and is responsible for strong biological responses of the cells ("How Ship Emissions Adversely Affect Lung Cells"). For example, inflammatory processes are triggered that may influence the development of interstitial lung diseases. Now the team led by Professor Ralf Zimmermann has found in further studies that macrophages are also influenced by the exhaust gases. These are much more sensitive than lung epithelial cells and therefore react more strongly to exposure. Zimmermann is speaker of the international consortium Helmholtz Virtual Institute of Complex Molecular Systems in Environmental Health (HICE), head of the cooperation group Comprehensive Molecular Analytics (CMA) at Helmholtz Zentrum Muenchen and head of the Department of Analytical Chemistry at the University of Rostock.

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La semana pasada, una masiva mina de carbón a cielo abierto, de 350 hectáreas en Druridge Bay, ganó su permiso de planificación. Esto hizo que Chris Goodall se preguntara: ¿y si la tierra se convirtiera en una granja solar en su lugar? Su descubrimiento es sorprendente: la energía solar en la costa sur de Inglaterra ya no cuesta más que el carbón: Sólo es cada vez más barata.

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The cost of offshore wind power in the North Sea is 30% lower than that of new nuclear, writes Kieran Cooke - helped along by low oil and steel prices, reduced maintenance and mass production. By 2030 the sector is expected to supply 7% of Europe's electricity. Output from the Dogger Bank project will be 1.2 GW (gigawatts) - enough to power more than a million homes. Next year, a 150-turbine wind farm off the coast of the Netherlands is due to start operating, and other schemes along the Dutch coast are in the works. Denmark, Sweden and Portugal are major investors in offshore wind, and China has ambitious plans for the sector. Wind farms - both onshore and offshore - are a key ingredient in renewable energy policy, and an important element in the battle against climate change. WindEurope, an offshore wind industry group, says that at the present rate of installations it's likely Europe will be producing about 7% of its electricity from offshore wind by 2030.

Offshore wind developers benefit from falling costs

By some calculations, all this building work would seem to make little economic sense. Fossil fuel prices are low on the world market, and constructing offshore wind farms several kilometres out at sea, in often treacherous conditions, has traditionally been an expensive business.

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Hace doce años, una profesora de cierta primaria consideró beneficioso que sus alumnos vieran un documental sobre el calentamiento global. Tema bastante sonado pero que por alguna razón no impactaba en las personas como debería, como debemos buscar que impacte. Así, a mis ocho años, vi por primera vez a un oso polar asustado por los cambios en su hogar. Observé inmensas cantidades de basura en lugares que en ese instante creí lejanos. Me preocupé. ¿Por qué hubo diferencias entre mi sentir y el de otros niños? 

A lo largo de mi vida continué notando diferencias. Unos separaban la basura, otros preferían culpar al basurero de revolverla y así ahorrarse el crucial hábito. Vi personas capaces de caminar a la orilla de la playa sin sentir punzadas en el estómago al ver pañales flotando en el mar o ríos contaminados o personas que deben aprender a tolerar olores nauseabundos afuera de sus casas, porque ahí les tocó vivir, porque así siempre ha sido. Cambiar implica romper con las costumbres y es más fácil mantenernos quietos, a la espera de… ¿de qué? ¿De perderlo todo, perdernos entre hedores y enfermedades? 

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Los animales que viven en altas elevaciones a menudo se supone que estar en riesgo de extinción conforme los hábitats se calientan y cambian. Pero un nuevo estudio dirigido por investigadores de la Universidad del Estado de Colorado encontró que la perdiz Nival, que viven en ecosistemas fríos, no se ve fuertemente afectada por las fluctuaciones estacionales en dos poblaciones estudiadas en Colorado.

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