Climate Action Tracker” which monitors the emission reduction pledges of different countries is a:

The correct option is: Database created by coalition of research organisations

Detailed Explanation:

The Climate Action Tracker (CAT) is an independent scientific analysis that tracks government climate action and measures it against the globally agreed Paris Agreement aim of holding warming to well below 2°C, and pursuing efforts to limit warming to 1.5°C.

It is not an official wing or committee of intergovernmental bodies like the IPCC or the UNFCCC, nor is it directly managed or financed by the UNEP or the World Bank. Instead, CAT is a prominent database and analysis tool created and maintained by a consortium of specialized research organizations.

The coalition of research organizations behind the Climate Action Tracker includes:
1. Climate Analytics: A non-profit climate science and policy institute based in Germany.
2. NewClimate Institute: An organization focused on supporting research and implementation of action against climate change globally.

By compiling data on national greenhouse gas emissions, pledges, and policies, the CAT database provides transparent, science-based assessments of where the world stands in terms of meeting climate targets, making it a highly reliable independent tracker rather than an official UN agency project.