Roasting coffee beans was a market worth over $1 billion globally in 2022, according to Grand View Research, which projects that figure could double by 2030. Traditional roasters, powered by the fossil fuel natural gas, still dominate the market. These machines are big and bulky and kind of look like part of a train. But the makers of more compact electric roasters are piling into the business. And they have an edge, touting themselves as high-tech alternatives that are more environmentally friendly and cheaper to run than their old-school counterparts. The BBC’s Frey Lindsay has more on the story.