A great Bulletin Board idea!
A sheet of blue paper overlaid with green.
Use pre-made, construction paper cut-outs, or paint on the text. Cut pool noodles in half length-wise to form tree-trunks, apply with tape or glue. Use Multi-colored Body Scubbers, or crumbled tissue paper for tree-tops. Use any desired material to add an awareness Ribbon to the composition, I used multi-color tissue. Lastly, find or create the Lorax character to pull it all together!