How do you eliminate major threats such as when people sell cactus or drive 4 wheelers in a desert?

These activities are illegal in some places already. However, there is usually no one to enforce the laws, or very few. Most law enforcement agencies are short handed and usually only respond to what they consider to be more serious issues. Cactus rustling and cross country driving are low priority issues, Education is an important way to show people why these activities should not be tolerated.