The attitude you bring to filling out a grant application comes through loud and clear to the funder who evaluates hundreds of applications each year. If you believe in what you are doing, this will shine through in your application. Be honest in discussing both your ends and your means. Remember that you are not engineering a scam or trying to trick someone into giving you money. If you want funds for a community tree planting, don't try to convince potential funders that your project will solve all the world's problems tomorrow.
Tree plantings are important in and of themselves.
There is nothing more eloquent than someone simply describing a problem in their community that is important to them and thesteps they would like to take toward resolving that problem. Leave the hyperbole behind. Flowery writing will never compensate for a poorly conceived activity - but good projects hidden under piles of distracting verbiage often end up in the discard bin. Obtaining grants is competitive, and many excellent proposals do not get funded. Show funders why they should support your project over the others.