How do scientists know about the levels of carbon in our atmosphere now and in the past?

Crisp points out that scientists know the increases in carbon dioxide are caused primarily by human activities because carbon produced by burning fossil fuels has a different ratio of heavy-to-light carbon atoms, so it leaves a distinct “fingerprint” that instruments can measure.

Answer the zagros mountains, stretch across western iran and are located next to the khuzestan plain; answer( zagros mountains

Answerwill have thinner; have thicker oceanic sediments;