Brazil carnival revellers warned that all that glitters is not good for the planet

Rio's vast annual street celebration features copious amounts of sparkling microplastics that find their way into the marine food chain

With Rio's enormous carnival in full swing, the streets are full of revellers in colourful fancy dress, thronging the city's many samba street parties. And among the looks, there is one carnival constant: multicoloured glitter smeared over bare skin.

But now worries over glitter's damaging environmental impact are dampening the mood at the world's biggest party.