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

Earth’s climate has long been shaped by subtle but powerful shifts in its orbit. These slow, predictable changes drive the planet in and out of ice ages over tens of thousands of years. A recent study offers new insights into this natural climate rhythm,