This is a learning activity that has one goal. To generate student thinking at a higher level. This is not intended at all to be graded, and it is not an assessment. It does not have a key.
The way I use it: The students answer with their opinions. Most are "cut and dry", and obvious.
HOWEVER, there are a few that will generate questions and great discussion.
This activity gets all students involved in a very important moral question. How should we care for our planet?