join Save trees save earth<br> CAUSE AND EFFECT . . .<br> This simple<br> experiment shows the importance<br> of trees on the<br> environment. The water that runs through soil with vegetation -- on<br> the left, comes out clear, while… 更多<br> that that without vegetation is<br> muddy.<br> COMMON SENSE. Yet, why do we<br> keep cutting the trees in our<br> forests and complaining why the<br> water in our rivers are so muddy<br> and dirty? Photo by Cordilleran<br> Environmentalist Roland Yawan. <br> Shared by Caitanya Manjari Pitaka to my wall.