Trump might label them “green scams”, but firms are quietly getting on with multi-million-dollar sustainability projects. Just ask beauty giant L’Oréal 

Few would choose the humble showerhead when asked to name a product vital to the world’s sustainable future. Unless you are a hair salon engaged in the business of washing customers’ hair, of course. Then using 70% less water could well matter as you attempt to cut your carbon footprint. It is more efficient as well. 

The Water Saver showerhead came from a partnership between the Swiss startup, Gjosa, and L’Oréal, the global beauty brand and Fortune 500 Europe member. At its most basic...