Foods to Avoid. When youâre feeling a bit wired, avoid foods containing caffeine, alcohol, sugars, and processed ingredients. Caffeine is a stimulant that can produce a jittery feeling that might amp up your anxiety.
The Ice Ages began 2.4 million years ago and lasted until 11,500 years ago. During this time, the earthâs climate repeatedly changed between very cold periods, during which glaciers covered large parts of the world (see map below), and very warm periods during which many of the glaciers melted.
About 700 million years ago, during the Cryogenian glaciation, runaway glaciers made Earth look like a snowball. The last ice age led to the rise of the woolly mammoth and the vast expansion of glaciers. But it's just one of many that have chilled Earth throughout the planet's 4.5-billion-year history. So, how often do ice ages happen, and when is the next freeze expected to begin? The answer to the first question depends on whether you're talking about big ice ages or the little ice ages that happen within those larger periods. Earth has undergone five big ice ages, some of which lasted for hundreds of millions of years. In fact, Earth is in a big ice age now, which explains why the planet has polar ice caps.