By 2030, almost all countries will experience “extreme hot” weather every other year due mainly to greenhouse gas pollution by a handful of big emitters, according to a paper published Thursday by Communications Earth & Environment, reinforcing forecasts that the coming year will be one of the hottest on record. The Sun has its ups and downs and cycles between them regularly. Roughly every 11 years, at the height of this cycle, the Sun's magnetic poles flip on Earth, that'd be like if the North and South Poles swapped places every decade and the Sun transitions from sluggish to active and stormy.