Skanska is a Swedish company which employs nearly 6,000 people in the UK and it is worth almost £2bn. If you're wondering what they do - they help maintain the London Undergound and they are building the £1bn link connecting up Manchester's two big railway stations - Victoria and Piccadilly.
Gregor Craig, boss of Skanska UK, told 5 live earlier that the company is trying to do its bit for emissions.
"Concrete is one of the big carbon emitters, largely due to the cement products that are within it. If our supply chain could, let’s say they are constructing a 200mm thick concrete slab, if they could make it just 180mm thick, then it would automatically save 10% of their emissions. It can be as simple as that in some cases," he said.
"I think we’re seeing a growing number of investors and funders to construction projects that are starting to require the way that buildings are being made to be a lot greener. There are a number of green funds that look very carefully at what they are funding and the way it is constructed."