4. What items are scientists looking at to find if warming and ice
ages are normal changes?

Evidence from ocean sediments, ice cores, tree rings, sedimentary rocks and coral reefs show that the current warming is occurring 10 times faster than it did in the past when Earth emerged from the ice ages, at a rate unprecedented in the last 1,300 years.

Explanation:

Hope it is helpful

answer; seattle and los angeles; (west)