Actually, based on the original prompt, the proper term should be " much discussed" as there is no evidence of arguments - ensuing based on the topic as provided. This is a case of incorrect LR usage.
Good job on the integrated question response and thisis statement. While the solutions could have been more direct, it still offers a clear discussion path going forward.
While this shows that you have excellent knowledge of international current events and public knowledge, a reference to how this problem is dealt with in your home country of Vietnam would have been far score increasing. You needed only 1 international reference to prove your point on an international scale.
Repeat the strength of your belief to create a more appropriate reverse summary.
Overall, you did a pretty good job analysing and discussing the topic with negligible errors. You just may pass the test based on this writing. a word of caution though, don't write more than 300 words. short but clear is better scored than length with little developed explanations per reason.