The Climate Change Performance Index is an instrument supposed to enhance transparency in international climate politics. Its aim is to encourage political and social pressure on those countries which have, up to now, failed to take ambitious actions on climate protection as well as to highlight countries with best-practice climate policies. On the basis of standardised criteria, the index evaluates and compares the climate protection performance of 58 countries that are, together, responsible for more than 90 percent of global energy-related CO2 emissions. 80 percent of the evaluation is based on objective indicators of emissions trend and emissions level. 20 percent of the index results are built upon national and international climate policy assessments by about 300 experts from the respective countries.