She said this urban programme represents a shift to areas where environmental challenges are more acute.
"These planting bags allow families to green their surroundings without large plots of land. It is a simple solution with the potential for big transformation, especially in informal settlements," Yang said.
She also urged national and county governments to support grassroots environmental initiatives, noting their importance in meeting President William Ruto's goal of planting 15 billion trees by 2030.
Teenagers who attended the workshop expressed enthusiasm about applying their new skills.
Ten-year-old Kelvin Ochieng', a Form Two student, said the training helped him understand his personal role in conservation.
"I used to think planting trees was only for adults or people with land. Now I know I can make a difference even from my small home with these planting bags. I want to teach my younger siblings the same," he said.
Eleven-year-old Mercy Akinyi, a primary school pupil, said the sessions helped her see the link between a clean environment and community health.
"I have learned that taking care of the environment is also taking care of ourselves. I want to start a small garden at home and maybe inspire my friends to do the same," she said.
In addition to training, Impact Steps distributed clothes, schoolbooks, and other essentials to the teenagers in preparation for the next school term.
Both organisations said they plan to continue similar programmes in Kibera as part of a long-term strategy to empower youth and strengthen community resilience against environmental degradation.