GEO QUIZ 2 Try 2

Global temperature anomaly

The difference between the current global temperature and the average temperature from 1850 to 1900.

Current Global temperature anomaly

+1.3 degrees Celsius.

Last Ice Age temperature

6 degrees Celsius cooler than today.

Percentage of change since the Ice Age

The current warming of 1.3 degrees Celsius is 20% of the total 6 degrees Celsius change since the Ice Age.

Projected warming by 2100

Likely to be between 2-3 degrees Celsius.

CO2 levels in 1750

250 parts per million (ppm).

CO2 levels in 2022

415 parts per million (ppm), almost a 50% increase.

Sources of CO2

1. Fossil fuel burning (coal, oil, natural gas) 2. Deforestation.

Positive feedback

A self-enhancing process in the climate system.

Negative feedback

A self-limiting process in the climate system.

Water Vapor Feedback

As global temperature increases, water vapor in the atmosphere increases, which is also a greenhouse gas.

Ice Albedo Feedback

Melting of Arctic sea ice reduces albedo, leading to more warming due to increased absorption of shortwave radiation.

Cloud feedback

Warming affects cloud types in ways that can either enhance or limit warming.

Climate Sensitivity

The increase in temperature when CO2 concentration doubles, estimated to be between 2-4.5 degrees Celsius.

Yearly CO2 emissions

About 50 gigatons of CO2 added to the atmosphere each year.