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La contaminación del aire en los hogares puede haber causado alrededor de 4,3 millones de muertes prematuras por enfermedades respiratorias en 2012, principalmente en los países en desarrollo, de acuerdo con un documento médico.

Tal contaminación aumenta dramáticamente el riesgo de niños y adultos para contraer la enfermedad pulmonar obstructiva crónica (EPOC), dice el documento, publicado en línea el mes pasado en Seminarios en Medicina Respiratoria y Cuidados Críticos.

When you flip on a light switch, odds are, you're burning coal. But as the fracking boom continues to unleash huge quantities of natural gas, the nation's electric grid is changing. Power plants are increasingly turning to this low-cost, cleaner-burning fossil fuel.

Bill Pentak stands in the middle of a construction site, looking up at his company's latest project towering overhead — a new natural gas power plant.

"This plant was sited precisely where it is because of its access to the abundant, high-quality natural gas that's found a mile to two miles beneath our feet," he says.

Americans throw away nearly half of their food every year, waste worth roughly $165 billion annually, according to a study by the Natural Resources Defense Council (NRDC). The report estimates that the average American family of four ends up throwing away an equivalent of up to $2,275 annually in food. Even worse, there is evidence that there has been a 50 percent jump in U.S. food waste since the 1970s.

In addition to carbon dioxide there are plenty of other greenhouse gases. Nitrous oxide is one of them. However, a global assessment of emissions from the oceans is difficult because the measurement methods used so far have only allowed rough estimates. Using a new technology for continuous measurements, researchers of the GEOMAR Helmholtz Centre for Ocean Research Kiel and the Christian-Albrechts-Universität zu Kiel have now discovered that nitrous oxide emissions from the Southeast Pacific are much higher than previously thought. They publish their data in the international journal Nature Gesoscience.

Reducing global greenhouse gas emissions could have big benefits in the U.S., according to a report released today by the U.S. Environmental Protection Agency (EPA), including thousands of avoided deaths from extreme heat, billions of dollars in saved infrastructure expenses, and prevented destruction of natural resources and ecosystems.