How does rising atmospheric CO2 affect marine organisms?

Learn how plants respond to higher atmospheric CO2 concentrations

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Global Historical Climatology Network (GHCN)
Temperature Calculations


For a description of the GHCN data set, visit the National Climatic Data Center's website (http://www.ncdc.noaa.gov/oa/climate/research/ghcn/ghcngrid.html).

To calculate a trend, input a period of record, a latitude range and a longitude range.  If you are unsure how and what to enter for these terms, click here.  Results will be returned in approximately 10 to 20 seconds after you have entered these parameters and clicked on the "Calculate trend" button below.

Beginning Year: Ending Year:
Southernmost Latitude: Northernmost Latitude:
Westernmost Longitude: Easternmost Longitude: