text: This March, for the first time in human history, the monthly average carbon dioxide in our atmosphere exceeded 400 parts per million. The range had been 170-300 parts per million for hundreds of thousands of years.
inputs.text: This March, for the first time in human history, the monthly average carbon dioxide in our atmosphere exceeded 400 parts per million. The range had been 170-300 parts per million for hundreds of thousands of years.