Mine-waste piles have long been seen as an environmental liability – until now. Canadian startup Arca is using WALL-E type rovers and giant microwaves to turn crushed rock into massive carbon-capture machines. Here’s how: www.begiant.ca/stories/idea...

This rover can help piles of mine waste ‘inhale’ carbon dioxideA Canadian startup is working on tailings technology to remove billions of tonnes of CO² from the airwww.begiant.ca