Uplifting news around the globe: Eco-friendly batteries and greener cement

A startup working on decarbonizing cement poured its first commercial concrete

Accounting for 8% of the world’s carbon emissions, traditional cement production heats limestone to over 2,500 degrees Fahrenheit to produce lime. But high-temperature kilns rely on fossil fuels, and limestone itself releases carbon dioxide in the process.

Instead, startup Sublime’s electrolyzer uses electrochemical reactions to dissolve materials at room temperature – eliminating both major sources of CO2 that result from making 4 billion metric tons of the world’s most-produced material each year. The technology can also use substances other than limestone. The company