Question

Discuss the relative importance of ice sheets, CO2, ice-free land albedo changes, and orbital parameter changes in explaining 'observed' climate changes 20,000 and 70,000 years ago.

Answer 1

Explanation:

By looking at past concentrations of greenhouse gasses in layers in ice cores, scientists can calculate how modern amounts of carbon dioxide and methane compare to those of the past, and, essentially, compare past concentrations of greenhouse gasses to temperature. Ice coring has been around since the 1950s.