What is the average annual increase in CO2 concentration between 1995 and 2000?
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Since this is not my area of expertise, I searched Google under the key words "CO2 Concentration 1995-2000" to get these possible sources:
http://scholar.google.com/scholar?q=Co2+Concentration+1995-2000&hl=en&client=safari&rls=en&um=1&ie=UTF-8&oi=scholart
http://pages.unibas.ch/botschoen/elevated_co2/index.shtml
http://books.google.com/books?id=ZfoUIfhX3YIC&pg=PA3&lpg=PA3&dq=Co2+Concentration+1995-2000&source=bl&ots=am8HriiYVX&sig=HD4H6xlGpJk6H5DJkt3cg7wEGkc
In the future, you can find the information you desire more quickly, if you use appropriate key words to do your own search. Also see http://hanlib.sou.edu/searchtools/.
I hope this helps. Thanks for asking.
To find the average annual increase in CO2 concentration between 1995 and 2000, you will need to subtract the CO2 concentration in 1995 from the concentration in 2000, and then divide the result by the number of years (i.e., 2000 - 1995 = 5).
To obtain the data for CO2 concentration in these years, you can refer to publicly available climate databases or research papers. One of the most commonly used sources is the National Oceanic and Atmospheric Administration (NOAA), which maintains a database called the Mauna Loa CO2 Monthly Mean Data. It provides monthly measurements of CO2 concentration since 1958 and includes an annual average.
Once you have the annual average measurements for 1995 and 2000, you can subtract the concentration in 1995 from the concentration in 2000 and divide the result by 5 to get the average annual increase in CO2 concentration between 1995 and 2000.