Greendex is a composite index developed by National Geographic and Globescan to measure the environmental sustainability of consumer behavior across various countries. It evaluates factors such as energy consumption, transportation choices, food sourcing, and waste management to assess how eco-friendly lifestyles are. The index aims to provide insights into global consumer trends related to sustainability and highlight areas for improvement. By comparing data from different nations, Greendex helps in understanding the relationship between consumer habits and their environmental impacts.