Green or red is defined as the colors of pricing charts used to show the change in value of an asset like cryptocurrencies or stocks.
A green color on charts means the price is increasing in value. While a read color on charts means the price is decreasing.
When you are “seeing green” that means overall, the charts are displaying a green color and the price has been increasing. Compared that with “seeing red” where the charts are mostly displaying a red color and the price has been decreasing.