Republic of the Congo, 1994 (IMAGE) Cell Press Caption This image shows the rainforest and Ndoki River near Mbeli and Mokeli. Researchers reporting in the journal One Earth on July 23 have developed a new method called the tropical forest vulnerability index (TFVI) to keep tabs on the vulnerability of these forests on a global scale using satellite data. Credit Photo by Michael Nichols, National Geographic. Usage Restrictions PERMITTED USE: These National Geographic images may be downloaded or are otherwise provided at no charge for one-time use for media coverage or promotion of the One Earth Rainforest Index paper, which is supported by the National Geographic and Rolex Perpetual Planet Program. Copying, distribution, archiving, sublicensing, sale, or resale of the images is prohibited. REQUIRED CREDIT AND CAPTION: Any and all image uses must (1) be properly credited to the relevant photographer, as appears in the file name and caption below, (2) be accompanied by a caption, which makes reference to the One Earth Rainforest Index scientific paper. DEFAULT: Failure to comply with the prohibitions and requirements set forth above will obligate the individual or entity receiving this image to pay a fee determined by National Geographic. License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.