Face masks are part of our daily lives during the coronavirus pandemic. Many are made from plastics and designed to be used just once, which means thousands of tonnes of extra waste going to landfill.Masks may help stop the spread of Covid-19. But according to one estimate, if everyone in Britain used a single-use mask each day for a year, it would create 66,000 tonnes of contaminated waste and 57,000 tonnes of plastic packaging.Evidence also suggests masks may be a source of harmful…