One strategy for Go Green, Get Lucky level 3 is to clear the leftmost pigs with the Yellow bird. Bomb the central structure with a White bird, then topple the tall stone tower with a Red bird. The score in the video below is 58,390.
For those looking to improve their score the second method below yields over 4,000 more points, for a total of 62,800. For this strategy, the Yellow bird clears all pigs on the right side, while the White bird clears the left.