Ueki no Housoku (TV)

Ai Mori is UFO hunter. While hunting for aliens at her school she observes a classmate Kousuke Ueki creating trees from his hands. Thinking she finally found an alien what she does find instead is that her teacher (Kobiyasha Sensei) is really a god and Ueki is his Junior High Student disciple. Up in the world of gods there is a contest, to see who will be the next ruler of Heaven (The current ruler just wants to party) and Kobiyasha is a candidate (of 138). The rules? Find a Junior High student and give them one special skill or power to turn one thing into another. Have them battle the other 137 students to see who's best (Knockout wins). The student who wins will be allowed the skill of (null) which allows them to pick any 1 skill they want. The god candidate then becomes the next ruler of heaven. The catch? If you use your power to harm any bystanders you will lose a skill that you normally have (like Running or Studying or 'Talking to Girls' hehe) or if your god candidate interferes, you lose your power and the god candidate is out of the race. When Kobiyasha asks Ueki what skill he wants to have (Water into Fire, Cloth into Steel, Rocks in bombs), he picks Trash into Trees.

So follow the battles of Ueki as he tries to turn this contest of destruction into a recycling game.