Sadly the Pollen Viewer visualization tool no longer works; however, there are animated gifs from the website that let you see the large-scale effects of climate change in North America during past 21,000 years.

Both the Pollen Viewer digital maps and the analysis software, Analyzing Digital Images, are available free on the Internet.

Select an area on a Pollen Viewer map, and calculate the abundance of plant species over time within this area.

Use available spreadsheet software, such as Microsoft Excel or Open Office, to manipulate the data and create graphs.