Sustainability: Science, Practice, & Policy (SSPP) provides data and visualizations as a free service. You may download data for use in research, publications, or presentations. We ask that you use the citation information provided as the source of the visualization. For each dataset, there is documentation that provides original data sources, details, and important information. Once the data have been downloaded from the site, SSPP cannot vouch for their quality and timeliness or for any analyses conducted with data retrieved.