Has Earth seen its last ‘ice age’?

Hundreds of millions of Americans are presently besieged by a massive arctic blast and winter storm. Luckily for them, it will only be temporary. That wasn’t the case 20,000 years ago…

Between 26,500 to around 19,000 years ago, gargantuan glaciers covered around a quarter of Earth’s land area year round. Their frigid reach extended to the areas that are now Minneapolis, Chicago, Detroit, and Boston. The average global temperature was then about 46 degrees Fahrenheit (8 degrees Celsius)...