Heck, based on the data shown, the increase in isotopes may even be random. It would need to be sustained longer over time before we can even begin to pinpoint

Heck, based on the data shown, the increase in isotopes may even be random. It would need to be sustained longer over time before we can even begin to pinpoint a source, welcome to a small part of the scientific process: you need more data before you can even find a coloration! then you need to control something before you can even find causation.