What are some things scientists look at to study climate change? (choose 3)

Question

Select one or more answers!

tree rings

glaciers (ancient ice samples)

the number of humans on Earth

ancient marine

Answer 1

sediments

polar ice cores

atmospheric carbon dioxide concentrations

Answer 2

Select one or more answers!

tree rings

glaciers (ancient ice samples)

the number of humans on Earth

Answer 3

tree rings

glaciers (ancient ice samples)