What's on the other side of a peak? Can you guess?
It's all natural. Happens like clockwork. All this gibberish you hear on the televitzing device and various Earth Changes numbskulls opinions are at best, mere shadows of the real truth, the deluded rantings of monkeys in manpants.
The real truth is not Planet Nibiru or pole shift or alien invasion or any of that rubbish. Trust human beings to always get it completely bass-ackwards.
It's the end of the interglacial at a peak of ending interglacials, pursuant to a magnetic reversal. Sorry the truth isn't as glamorous or as exciting as a Hollywood movie, but there you have it.