Answer:
You should start off your poem by making a powerful statement regarding deforestation. This could be something that appeals to emotions, or perhaps some statistic regarding deforestation. Or, you could also write your poem from the point of view of nature/a tree. It is also important to consider what type of poem you are writting. Whether you are writing a haiku, a free verse, a limerick, or other will impact how much you can say in the poem.
Step-by-step explanation:
I hope this gives you an idea for your poem, you could also look at examples of poems written about deforestation. Keep in mind what you want to achieve with your poem (to persuade, inform, etc). Also, take a look at the rthetorical appeals (ethos, pathos, and logos), they might help you in writing your poem.