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Science and technology are advancing at tremendous speed. We may think we’re a culture that gets rid of our 1． technology at the first sight of something shiny and new, but a new study shows that we keep using our old devices well after they go out of style. That’s bad news for the environment — and our wallets — as these outdated devices 2． much more energy than the newer ones that do the same things.

To figure out how much power these devices are using, Callie Babbitt and her colleagues at the Rochester Institute of Technology in New York 3． the environmental costs for each product throughout its life — from when its minerals are mined to when we stop using the device. This method provided a readout for how home energy use has 4． since the early 1990s. The devices were 5． by generation — Desktop computers, basic mobile phones, and box-set TVs defined 1992. Digital cameras arrived on the 6． in 1997. And MP3 players, smart phones, and LCD TVs entered homes in 2002, before tablets and e-readers showed up in 2007.

As we accumulated more devices, however, we didn’t throw out our old ones. “The living-room television is replaced and gets 7． in the kids’ room, and suddenly one day, you have a TV in every room of the house,” said one researcher. The 8． number of electronic devices rose from four per household in 1992 to thirteen in 2007. We’re not just keeping these old devices — we continue to use them. According to the analysis of Babbitt’s team, old desktop monitors and box TVs with cathode ray tubes are the worst devices with their energy consumption and 9． to greenhouse gas emissions more than doubling during the 1992 to 2007 window.

So what’s the possible solution? The team’s data only went up to 2007, but the researchers also explored what would happen if consumers would replace old products with new electronics that 10． more than one function, such as a tablet for word processing and TV viewing. They found that more on-demand entertainment viewing on tablets instead of TVs and desktop computers could cut energy consumption by 44%.