evidence of climate change

Question 1

sea level rise

Answer 1

Between 1900 and 2018, average global sea level rose by 0.21 m due to thermal expansion

Question 2

ice cores

Answer 2

oxygen isotopes in ice in Antarctica change according to temperatures: more of certain isotopes indicate a change in climate

Question 3

ocean temperature

Answer 3

oceans are the warmest since research began in 1850

Question 4

proxy data

Answer 4

fossils/pollen show evidence of previous climates in other areas

Question 5

ice cores

Answer 5

When snow falls it traps air into the ice. When scientists take a sample of ice it reveals the atmospheric gas concentrations at the time the snow fell. This is used to calculate temperature at that time.

Question 6

tree rings

Answer 6

tree rings usually grow wider in warm, wet years and they are thinner in years when it is cold and dry.

Question 7

quaternary period

Answer 7

time stretching from 2.6 millions years ago to now