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Consumers are hungry for clearer television screens, more powerful laptops, and smarter phones. But because those electronics require a significant amount of energy to manufacture, and because consumers replace them frequently, they are greater contributors to climate change than previously recognized, a new study suggests (Environ. Sci. Technol., DOI: 10.1021/es201459c).

Since the 1980s, conventional wisdom has held that large appliances, such as clothes dryers and refrigerators, are the home’s biggest source of greenhouse gases, aside from heating and lighting. But the proliferation of consumer electronics may have changed the scenario, guessed Edgar Hertwich, a professor of energy and process engineering at the Norwegian University of Science and Technology.

To test the idea, Hertwich and his colleague Charlotte Roux modeled the greenhouse gases that come from household electronics and appliances in Norwegian homes in 2008. Using data from life-cycle assessments, sales reports, and other studies, they calculated the greenhouse emissions of the devices, considering manufacture, use, and disposal.

They found that freezers and refrigerators accounted for the most emissions: the equivalent of about 1,500 pounds of carbon dioxide per household in 2008. Televisions and computers ranked second and third, contributing about 1,300 and 1,100 pounds of greenhouse emissions, respectively.

Taken together, entertainment devices-including televisions, computers, DVD players, audio equipment, phones, and game consoles-produced more greenhouse gases than the traditional household appliances did combined.