Answer:
There is a need for more studies.
Step-by-step explanation:
Most possibly in the mentioned case, scientists will perform more studies and experiments in order to attain more knowledge regarding the subject. For example, if they compare paper grocery bag with the plastic grocery bag it is essential to find that which one is better for producing, which one is a better resource use in the life cycles, or whether one of them can be reused. Thus, there are many questions regarding the issue.