Singer Pixie Lott, who presents the investigation, says: “I love ice cold lattes on a hot summer’s day, and so do you, because we’ve drunk £395m worth, and that is a lot of plastic cups.

This story is part of Planet or Plastic?—our multiyear effort to raise awareness about the global plastic waste crisis. Learn what you can do to reduce your own single-use plastics, and take ...

4. Do a demonstration to show how the temperature changes when a cup of warm water is placed in a container of ice water. Put warm water (40 °C or about 100 °F) in a small clear plastic cup until it ...

Related: Make an Ice Ring, Ice Cups, or Ice Shards to Keep Punch Cool ... and the high heat in dishwashers can degrade ...