How Plate Tectonics, Mountains, and Deep-Sea Sediments Have Maintained Earth's 'Goldilocks' Climate

For hundreds of millions of years, Earth's climate has warmed and cooled with natural fluctuations in the level of carbon dioxide (CO₂) in the atmosphere. Over the past century, humans have pushed CO₂ levels to their highest in two million years--overtaking natural emissions--mostly by burning fossil fuels, causing ongoing global warming that may make parts […]