What's the State of Out of Sample Validation of These Models?

Faris: A lot of the data for these models that feed in to these models is based on, not data, like the path for carbon. We know our concentration of carbon going back to the beginning of the 20th century more or less,. Is that Faris even before with measurement of like ice cores, which might be erratic, they're not so easy to get? "I think we have decent, decent appraisals of what we do and don't know there," he says.