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Everyone has seen warnings at the end of email saying, “Please consider the environment before printing.” But for those who care about global warming, you might want to consider not writing so many emails in the first place.

More and more, people rely on their electronic mailbox as a life organizer. Old emails, photos and files from years past sit undisturbed, awaiting a search for a name, address or photo of an old boyfriend.

The problem is that all those messages require energy to preserve them. And despite the tech industry’s focus on renewables, the advents of streaming and artificial intelligence are only accelerating the amount of fossil fuels burned to keep data servers up.

Right now, data centers consume about 2 percent of the world’s electricity, but that is expected to reach 8 percent by 2030. Moreover, only about 6 percent of all data ever created is in active use today, according to research from Hewlett Packard Enterprise. That means 94 percent is sitting in a vast “landfill” with a massive carbon footprint.

“It’s costing us the equivalent of maintaining the airline industry for data we don’t even use,” said Andrew Choi, a senior research analyst at Parnassus Investments, a $27 billion environmental, social and governance firm (ESG) in San Francisco.

Kirk Bresniker, chief architect of Hewlett Packard Labs, said these server farms use energy both to retain your data and when you use it.

“If I want to actually do something with my data, I have to warm it up and move it through the data center,” he said. And when you empty the email trash, you probably aren’t actually erasing the data. Multiple copies of even decade-old emails are stored on servers around the world, still using energy.

The sum of all the world’s data in 2018 was 33 zettabytes — 33 trillion gigabytes — but by 2025 it could increase fivefold, to 175 zettabytes, according to International Data Corp. Every day, the world produces about 2.5 quintillion bytes of data.

This is a sector “where emissions are increasingly getting out of control,” said Philippe Zaouati, chief executive officer of Paris-based Mirova, a $15 billion sustainable asset manager. “We need to decrease carbon emissions, and what we see in the IT sector is increasing emissions.”

Socially conscious investors have historically been attracted to tech stocks, based on the assumption that it is a low-emissions industry. Some are starting to rethink that.

Choi says the problem is getting too big, too fast. How many photos are sitting untouched in the cloud? Is there a net benefit from an internet-connected toothbrush? Is an AI model that enables slightly faster food delivery really worth the energy cost? Training an AI model emits about as much carbon as the lifetime emissions associated with running five cars.

Parnassus has been focusing on Advanced Micro Devices and Nvidia, companies that are researching more efficient storage technology. But Choi says real solutions may require more radical thoughts.

“Data is possibly overstated as an advantage for business, and no one’s really asking the question,” he said. “If a small group of people are the only ones really benefiting from this data revolution, then what are we actually doing, using all of this power?”

So far, the tech industry’s main response has been to buy more renewable energy, contracting for almost 6,000 megawatts of power from nonfossil fuels last year — triple what it bought in 2017, according to BloombergNEF.

“Data-center need is moving so quickly that most companies can’t keep up,” said Kevin Hagen, vice president of ESG strategy at the data-center real estate company Iron Mountain. It bought up so much renewable power last year that it started using it as a selling point, telling potential customers how much they could reduce their carbon footprint by using its servers.

But eventually there may not be enough renewable energy to satisfy the industry’s demand. Iron Mountain’s overall electricity use has been doubling from year to year.

Being aware of the problem may help focus more companies on the climate cost of electronic storage. Microsoft this month unveiled a first-of-its-kind sustainability calculator for its cloud customers so they can see the emissions generated by their data.

“It’s a question customers were increasingly asking,” said Microsoft President Brad Smith. “I don’t think there’s much doubt in our minds about this as a decadelong, global phenomenon where we are going to see an inexorable rise in demand for technology.”

BloombergNEF warns that energy efficiency upgrades or other technological improvements are unlikely to offset data’s greenhouse gas emissions, even if they are deployed quickly. Computing workloads are likely to more than double as more AI comes online, more devices are connected and people do more work in the cloud.

But no one seems to know how much fossil fuel energy is being used versus how much is being offset.

Bresniker says the tech industry is “flying blind” when it comes to the true cost of storing data. The picture is clouded by a constant stream of efficiency and memory upgrades, increased renewable power and AI aimed at data-center efficiency.

“We don’t really understand what the footprint is,” he said.

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