The Climate Action Tracker is an independent scientific analysis that tracks government climate action and measures it against the globally agreed Paris Agreement aim of "holding warming well below 2°C, and pursuing efforts to limit warming to 1.5°C." A collaboration of two organisations, Climate Analytics and New Climate Institute, the CAT has been providing this independent analysis to policymakers since 2009. CAT quantifies and evaluates climate change mitigation commitments, and assesses, whether countries are on track to meeting those. It then aggregates country action to the global level, determining likely temperature increase by the end of the century. CAT also develops sectoral analysis to illustrate required pathways for meeting the global temperature goals. CAT covers all the biggest emitters and a representative sample of smaller emitters covering about 80% of global emissions and approximately 70% of global population. The national actions we track are: > Effect of current policies on emissions: The policies a government has implemented or enacted and how these are likely to affect national emission over the time period to 2030, and where possible beyond. > Impact of pledges, targets and NDCs on national emissions over the time period to 2030, and where possible beyond. > Fair share and comparability of effort: Whether a government is doing its “fair share” compared with others towards the global effort to limit warming consistent with the Paris Agreement. The Climate Action Tracker assesses the total global effort of NDCs, pledges and current policies on: > Global warming over the 21st century. Global emissions pathways consistent with government actions are analyzed and climate consequences projected using a carbon-cycle / climate model (MAGICC). > Emissions Gap: The gap in 2025 and 2030 between the emissions levels needed to limit warming below a 2°C increase above pre-industrial levels (and to bring warming below 1.5°C by 2100) and the emissions that are projected to result from NDCs, pledges and current policies.