Re: this paragraph in your otherwise quite interesting article on heat pumps.
"The selling point was simple - while other companies were using hydrofluorocarbons (HFCs) - a potent greenhouse gas that is being banned by the EU - as the coolant, Star proposed using ammonia, which contains no carbon."
You see, you know what you have done there? You've seen the word "carbon" and assumed that makes things greenhouse gases. Water vapour is a greenhouse gas yet is remarkably low in carbon. Next time you put science in a business story, why not ask a scientist?