While others believe that there are more challenging environmental obstacles. I would
Incorrect sentence structure. A comma, rather than a period is required in this presentation as the current prior sentence lends itself, based on its structure, to additional information being presented due to the presence of the word "While" which refers to a period of interval or time between thoughts.
The structure requires a general reference to other points of view due to the reference to "some people" and "others". Therefore, there needs to be 2 third person pronoun paragraph references prior to a full first person pronoun reference discussion. This shows the comparative format (for the first 2 points of view) and the personal opinion (third paragraph). You need to expand the discussion of your personal opinion as it should either support one of the two given statements or, result in a totally different discussion. That is why you cannot present your personal opinion as a single sentence in the concluding summary.
While you will still get a score for this presentation, it will not be as high as it could have been, had you used the proper format for the discussion presentation.