In 2015, flights produced 781 million tons of CO2 worldwide. This is barely 2 percent of all human-induced carbon dioxide emissions. Globally, humans produced over 36 billion tons of CO2. And here’s a really fun fact: data centers emit more CO2 than the global airline industry. Overheated Data Centers Every laptop owner (especially those who also own cats) knows that computers produce a lot of excess heat. Data centers, comprising tens of thousands of servers, waste massive amounts of energy and money trying to keep them cool. Throughout time, various strategies were tested, including moving facilities near the Arctic Circle (Facebook) or submerging servers underwater (Microsoft). While Facebook’s decision to build its first data center outside of the US in northern Sweden uses the -4F outside air to keep temperatures constant, a Dutch company took the reverse method: it uses the heat generated by servers to heat people’s homes. Repurposing Heat from the Cloud Back in 2015, Nerdalize worked with Eneco, a Dutch utility company, to test a heating system that feeds on residual heat of computer servers. Watch a video about the test. Their year-long pilot ran in five households. Each home had a server installed on the premise, powering a standalone wall heater. The heaters were slow, took about one hour to warm up and were also weak, able to provide sufficient heat only for a small room. But the fact that they worked encouraged them to explore the idea further. And an interesting idea it is—instead of paying for high-energy usage to cool the servers, they save households around $336 a year on their heating bills, while also cutting back on CO2 emissions. Per a company press release, each installation takes three tons of CO2 away from a household’s carbon footprint....