When consumers think of ways to reduce their carbon footprint, they probably think of ways to reduce car consumption, eat less animal products and reduce waste. But there is another, perhaps simpler, way to reduce emissions: delete old emails.? Your cluttered email inbox is a lesser-known climate villain that consumes energy and collectively produces hundreds of thousands of tons of carbon dioxide every day for years, even decades. Last year, 4.2 billion email users sent and received 333 billion emails a day, a number expected to reach 400 billion by 2026, Statista estimates. Meanwhile, the data centers and servers that transmit and store each email consume significant amounts of energy. According to Mike Berners-Lee, a UK carbon footprint researcher at Lancaster University, the energy and environmental costs of email are under-researched. The electricity consumed by e-mails results in a wide range of CO2 equivalents: from 0.05 grams for a spam e-mail caught by filters to 29 grams for a long e-mail sent to 100 people, he estimates. (Ab Nacef)