78. Say what vital and crucial problems the teenagers solve in the 21st century.

Teenagers face various crucial problems such as dangerous diseases (like AIDS and cancer), environmental pollution, drug abuse, terrorism, and the rise of new local wars. Additionally, they encounter challenges like dangerous technologies, endangered animals, everyday problems, and the influence of computer control over the world. Issues of globalization, information overload, and even the idea of star wars also pose challenges to their lives.