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Amazon has changed the way Americans shop. This year, the e-commerce giant said its annual Prime Day sale was “the biggest shopping event in Amazon history.” During the 36-hour event, people bought over 100 million products, crashed the website, and signed up for more Prime memberships than ever before. The behavior is indicative of the buying culture Amazon created. The company’s ease, speed, and savings — underscored by killer perks like free, expedited shipping and simple returns — has encouraged more people to shop online, more often.

But these free benefits come with a hidden environmental cost that doesn’t show up on the checkout page, experts say. Expedited shipping means your packages may not be as consolidated as they could be, leading to more cars and trucks required to deliver them, and an increase in packaging waste, which researchers have found is adding more congestion to our cities, pollutants to our air, and cardboard to our landfills.

“People are consuming more. There’s more demand created by the availability of these cheap products and cheap delivery options.”

A new study claims 44.7 million metric tons (49.3 million tons) of TV sets, refrigerators, cellphones and other electrical good were discarded last year, with only a fifth recycled to recover the valuable raw materials inside.

The U.N.-backed study published Wednesday calculates that the amount of e-waste thrown away in 2016 included a million tons of chargers alone.

The U.S. accounted for 6.3 million metric tons, partly due to the fact that the American market for heavy goods is saturated.

The study says all the gold, silver, copper and other valuable materials would have been worth $55 billion had they been recovered.

The authors of the Global E-waste Monitor predict that e-waste, defined as anything with a battery or a cord, will increase to 52.2 million metric tons by 2021.

“Our computers and smartphones might seem “clean,” but the digital economy uses a tenth of the world’s electricity—and that share will only increase, with serious consequences for the economy and the environment.

The global Information-Communications-Technologies (ICT) system now uses approximately 1,500 terawatt-hours of power per year. That’s about 10% of the world’s total electricity generation or roughly the combined power production of Germany and Japan. It’s the same amount of electricity that was used to light the entire planet in 1985. We already use 50% more energy to move bytes than we do to move planes in global aviation.

Reduced to personal terms, although charging up a single tablet or smart phone requires a negligible amount of electricity, using either to watch an hour of video weekly consumes annually more electricity in the remote networks than two new refrigerators use in a year. And as the world continues to electrify, migrating towards one refrigerator per household, it also evolves towards several smartphones and equivalent per person.”

“Does reading an e-book, or watching a streaming video, use more energy than reading it on paper, or buying a DVD? Does playing a video game use more energy than playing Monopoly? Does a doctor using an iPad for diagnostic advice from artificial intelligence in the Cloud use more energy than, what? Traveling for a second opinion?  The answer involves more than knowing how much electricity one iPad, PC or smartphone uses. It requires accounting for all the electricity used in the entire ICT ecosystem needed to make any of that possible, and the energy characteristics of the ICT ecosystem are quite unlike anything else built to date. Turning on a light does not require dozens of lights to turn on elsewhere. However, turn on an iPad to watch a video and iPad-like devices all over the country, even all over the world, simultaneously light up throughout a vast network. Nothing else in society operates that way. Starting a car doesn’t cause dozens of cars elsewhere to fire up.”

“Forty percent of all U.S. electronics recyclers testers included in [a study that used GPS trackers to follow e-waste over the course of two years] proved to be complete shams, with e-waste getting shipped wholesale to landfills in Hong Kong, China, and developing nations in Africa and Asia.

Rather than recycle them domestically, the recycling companies sell them to junkyards in developing nations, either through middlemen or directly. These foreign junkyards hire low-wage employees to pick through the few valuable components of often toxic old machines. The toxic machines are then left in the scrapyards or dumped nearby. Using GPS trackers, industry watchdog Basel Action Network found that 40 percent of electronics recyclers it tested in the United States fall into this “scam recycling” category.”