How do scientists study pollen grains to help them understand climate change

Explanation:

When scientists take a sediment core, they sometimes find that pollen from different species dominates in different eras. And since plants thrive best under particular temperatures and conditions, researchers can use the pollen mix to determine the climate of an era.

explanation:

for  example, forests have higher evapotranspiration than other ecosystems,  such  as grasslands, because of their deeper roots and greater leaf area. thus forests have a net moistening effect on the atmosphere and become a moisture source for downwind ecosystems.