David removes 8 plant resources from his plant box on the player board, increasing oxygen level 1 step, and raising his terraform rating 1 step as well. Then he takes a greenery tile and places it between 2 of his city tiles, and takes the placement bonus, which happens to be 2 plants, as printed on the chosen area.

Not only did this yield 1 TR plus placement bonus, but the greenery will be worth 1 VP in itself as well as 1 VP to each adjacent city in the end game scoring.