This is the main page of the Global Trend Visualizer tool that may be used to document and track changes that are happening in our terrestrial environment. Select a parameter from the side bar to access a global map that serves as your key to viewing actual data. Technical information as well as credits to scientists and supporting agencies may be found in attached ReadMe files. The data used on these pages was transferred via ftp from the Distributed Active Archive Center at the Goddard Space Flight Center of the National Aeronautics and Space Administration. We are indebted to them for making all the data easy to access and use.