As President Donald Trump's administration looks to reverse a cornerstone finding that climate change endangers human health and welfare, scientists say they just need to look around because it's obvious how bad global warming is and how it's getting worse.

Scientists have determined exactly how Earth's orbit and tilt affect glaciation and deglaciation, based on the length of these parameters' cycles and clues hidden at the bottom of the ocean.

Over 700 million years ago, Earth experienced a dramatic climate event known as the Sturtian glaciation, one of the most extreme ice ages in history. During this period, the planet was encased in ice from pole to equator,