Planting trees is a good thing. It increases biodiversity, it helps in preserving the land surface, it provides protection from floods. You may remember from your biology class days that trees are part of the carbon cycle, absorbing carbon dioxide and producing oxygen.

This could be the brief and concise answers to question of benefits of plants. I am completely agree with you. Planting more trees has no Disadvantage and cutting trees have not a single advantage.

We should look to our surrounding who things are getting change day by day. Look at the extreme hot weather this summer in Pakistan. The unwanted rains, flooding, soil erosion, air pollution all these are the causes of cutting trees. In reality we are not cutting the trees, we are cutting our life spend. We cut the life spend of the earth.

It's very nice to see your post here. Thanks for enlighten us with your precious knowledge.
Best wishes in the contest.