How do you choose a good high school informative speech topic?

Since we cannot do your homework for you, we can only pass along thoughts and ideas.

If I were asked to give an informative speech, I'd pick a topic that I personally want to know more about. Then, I'd figure out how this topic most affects me and my mates, or affects animals, or affects politics. Pick something the topic affects.

Then, you can narrow your research to the topic and the group affected, and prepare your informative speech.

Before you start, best practices dictate that you fully understand how you will be measured in this exercise.