In the spring, CO2 in the atmosphere 

In the picture below you will see tree cores taken from various sources; A – A tree living in 2025 when it was cored (no bark is on the core).  B – A dead tree that began growth in ___________ C – A log from a Native American home

Choose all of the countries listed below that have had a 100 % or MORE increase in precipitation (rain/snow).

A paleopyrogeographer has put together the following chart.  Of the years listed below, what year had the largest fires?  

  The primary role of the IPCC is to 

This dendrochronology record is from Arizona. The thick layers could be representative of __________ .

You are researching ice cores.  The bottom of your core has been dated at 500 CE (common era).  The ice at this depth and age contains a higher ratio of O18 (Oxygen Isotope 18) than O16 (Oxygen Isotope 16).  What can you conclude about the temperatures and the amount of ice on Earth at this time?

Oceanographers or geographers that study climate change can use foraminifera to see what type of oxygen was around at a certain year before present because their shells are composed of calcium carbonate.  Calcium carbonate contains __________ that are used to calculate past climates.

a steep increase in the average temperature of the Earth’s surface generally attributed to the greenhouse effect caused by increased levels of carbon dioxide, other greenhouse gases, and changes in our land use is the general definition of:

  Sun activity varies on a trend of _______ year patterns.