with glacial and interglacial periods a result, as Lorraine Lisiecki, from UC Santa Barbara’s Earth Science Department, ...

However, this changes, with two cycles of periods of 100,000 and 400,000 years. In the future, northern hemisphere summer will take place when Earth is closer to the sun, as Earth's orbital ...

Glacial periods are separated by warmer interglacial periods ... far ice sheets extended when the organisms were alive, Barker explained. Obliquity primarily determines how much sunlight hits ...

Hundreds of large mammal species disappeared during the transition from the last glaciation to the present interglacial period, from around 50,000 to 5,000 years ago. We are looking at the effects of ...