Summarising the data: 
  The plants which were given vinegar did not grow as healthily as those which were given water. This shows that acid rain does have an impact on plants such as-- slower growth, injury, and even death. Although there are other factors contributing to the formation of acid rain, our experiment has determined that liquid of smaller pH than 7 (acidic) does affect the growth of plants negatively, hindering their growth.
  Nowadays, with pollution getting more severe by the day, acid rain is being formed rapidly. It causes acidification of lakes and streams and contributes to the damage of trees at high elevations. Sulfates and nitrates even contribute to visibility degradation and harm public health. Thus, this has to be put to stop and all of us have to play our part so as to reduce the forming of acid rain.