Fill in the table below based on the global temperature record:

Time period Number of years with mean Temp. > 0° to +1° above mean Number of years with mean Temp. more than +1° above mean Number of years with mean Temp. < 0° to -1° below mean

1880-1899 0 0 20

1900-1919

1920-1939

1940-1959

1960-1979

1980-1999

2000-2019

Have global temperatures risen or fallen since 1900, and how much have they changed (how many temperature degrees) .

What is the size of the overall temperature changes in USA (how many degrees has it changed, see previous graph!) and how does this compare to the size of the global temperature change calculated in the previous question?

Are the years with the highest and lowest annual temperatures the same on both graphs (are the same in the USA versus in the world)? If not how much do they differ?

Are the points with the highest and lowest 5 year average temperatures the same on both graphs? If not how much to they differ (i. e. how much time is there between them)?

Suggest a reason why mean annual temperature in USA may differ from mean global temperature. (Hint: think about USA’s geographic position on earth, how is USA different from the average values you would get looking at all of earth, what’s special about it)