For Environmental Sustainability class:
I built a Google Docs spreadsheet ap embodying the regression model obtained by Judith Lean and David Rind in their 2009 paper, How will Earth's climate change in future decades, which we have been studying.
Instructions are here.
The calculator is here.
(Note, there are no margins of error given in this simple ap. To see the margins of error, which are important, you would have to get the basic data and replicate the model in a stats program such as .JMP or Smith's Statistical Package (a free download). I will give extra credit to any student who replicates this analysis on their own using the software package of their choice. See me for the data.)