Due to a scientific quirk called the Mpemba effect hot water can freeze quicker than cold water.
So, to alleviate global warming, if you want ice cubes, boil the water in the kettle first 
This has an interesting global side effect… If we just let global warming continue, then it will fix itself… admittedly this would most likely be after another ice age, but hell, in 70 years it’ll be someone else problem anyhow.
