Some 15 or so years from now, the “polar vortex” might not sound so bad. European scientists warn that by 2030, a decade of winters with deep freezing temperatures could bring about a “mini ice age” the likes of which hasn’t been seen in 370 years. Researchers at Northumbria University, led by Professor Valentina Zharkova, used mathematical models to predict solar activity will drop by 60% and trigger plunging temps around the world. The last time this happened was between 1645 and 1715, the Independent reported. More testing will be needed, but Zharkova is confident about her outlook.