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 was the concentration of carbon dioxide in the atmosphere 100 years ago?

• 200 parts per million

• 400 parts per million

• 500 parts per million

• 300 parts per million

Which of the following activities is NOT mentioned as a contributor to increased CO2 levels?

• Deforestation

• Making cement

• Burning coal

• Using solar panels

Why is the 400 parts per million mark considered significant?

• It is the same as the world population.

• It is the highest level ever recorded.

• It marks a new phase in human history.

• It is the lowest level in 800,000 years.

What are some of the potential consequences of reaching 400 PPM?

• Stabilized sea levels

• Reduced greenhouse gas emissions

• Decreased global temperatures

• More frequent natural disasters

What is the main message of the final section?

• To continue current practices

• To ignore the rising CO2 levels

• To increase fossil fuel usage

• To raise awareness and reduce emissions