15. Legalizing marijuana
Marijuana is legal in some countries. In others not. There are many pros and many cons of legalizing this drug, and therefore this could be a good controversial debate topic for high school.

Doug Shutter/Shutterstock.com
Marijuana is legal in some countries. In others not. There are many pros and many cons of legalizing this drug, and therefore this could be a good controversial debate topic for high school.
Doug Shutter/Shutterstock.com