Clean technology funds are money that people can invest in companies that are trying to develop and use new technologies that help protect the environment. These investments help companies come up with new ideas and solutions to make the world cleaner and healthier. For example, a clean technology fund might invest in renewable energy technologies like solar and wind, energy efficiency tools to help people save power, or clean water systems for people who don’t have access to clean water. By investing in these companies and ideas, people are helping make the world a better place.