The statement "Carbon credits are traded at a price fixed from time to time of the United Nation Environment Programme" is incorrect because carbon credits are typically traded on various carbon markets where prices are determined by supply and demand rather than being fixed by any single organization, including the United Nations Environment Programme (UNEP). Carbon markets, such as the European Union Emissions Trading Scheme (EU ETS), establish prices through market mechanisms, reflecting the economic activity and regulatory frameworks in place, rather than relying on a fixed price determined by a specific authority. Understanding the nature of carbon trading is crucial for appreciating how market-based solutions aim to combat climate change, highlighting the importance of economic principles and policies in environmental governance as studied in standard UPSC materials.