climate change Flashcards
what is the evidence of climate change
pollen analysis
tree rings
how do scientists use pollen analysis
pollen is preserved in sediment
scientists can identify and date species living at that time + track climate of them at that time
how do scientists use tree rings
trees grow new rings every year. they grow better in wetter and warmer conditions
they core trees and observe the size of ring
what are the natural causes of climate change
volcanic activity and solar outpu t
how does volcanic activity cause climate change
eject material into atmosphere which reflects suns rays back to space which cools earths surface
how does solar output cause climate change
energy output from sun changes in cycles of around 11 years. reduced solar output causes a cooler climate
What are the human causes of climate change
burning fossil fuels
deforestation
