Now, however, green is usually good. Being green more often means doing good things for the environment. People who are good at growing plants have a green thumb. Many companies are going green, which means they are recycling more or are trying to use less energy. In fact, some companies are moving to new, green buildings, which may use solar power or grow plants on their roofs. So if someone asks you how green you are, it probably means they want to know if you do good things for the environment.