See: Blue Chip Stock.
A blue chip stock represents shares of large, well-known firms that have a long history of sound financial performance. They are the kind of companies that populate the Dow Jones Industrial Average, or see their former executives get named to cabinet posts.
A green chip stock borrows its name from the blue chippers. But the green version has an environmental focus.
A green chip stock is one issued by a company whose business is considered environmentally friendly. Solar panel makers. Wind farm operator. Wheat grass refineries. And the King: Tesla.