This figure shows more than 4 billion years’ temperature data as adapted from Scotese (2002) and reveals that the Earth is now in one of the coldest periods in its history. No geological period has been as cold as our current geologic period, the Quaternary, for at least 250 million years. Temperature variations of more than 10°C (18°F) in either … Continue reading We are living in one of the coldest periods in all of Earth’s history.