The UK is falling behind on international efforts to tackle microplastics, scientists have said, as the pollutants continue to infiltrate food, ecosystems and human bodies.

The tiny fragments of plastic have been found in human testicles and brains, and they burrow into plants, inhibiting their ability to photosynthesise. The impact on human health is largely unknown, but they have been linked to strokes and heart attacks.

Microplastics are broken down from plastic waste and have polluted the entire planet, from the summit of Mount Everest to the deepest oceans. People consume the tiny particles via food, water and by breathing them in.