400 Parts in a Million - The World's Biggest Experiment

The video discusses a significant milestone in the world's largest uncontrolled experiment: the concentration of carbon dioxide in the Earth's atmosphere reaching 400 parts per million. This change, from 300 parts per million a century ago, is attributed to human activities like burning fossil fuels and deforestation. The video highlights the consequences of this increase, such as extreme weather events and rising sea levels, and calls for public awareness and action. It emphasizes the role of individuals and corporations in contributing to greenhouse gas emissions and encourages responsible behavior to mitigate further impact.

What does reaching 400 parts per million of CO2 indicate about our current phase in the global experiment?

What are some of the expected consequences of exceeding 400 PPM of CO2 in the atmosphere?