Sustainable development is impossible without protections for an area's ecosystem and its native plants and animals. And few creatures are as crucial to the planet's health as bees since most food crops depend on their work as pollinators.

All this week, CGTN has been putting a spotlight on the city of Curitiba, Brazil, and its pioneering work toward sustainability.

Today, in Part 4, CGTN's correspondent Paulo Cabral explores a city project to raise awareness of bees' importance while also boosting the bee population.