Every morning in Navjivan Vihar, South Delhi, 280 families start their day like most of us — making tea, packing lunchboxes, and getting ready for work or school. But there’s one small thing they all do that makes their colony very different: they separate their waste into three bins — wet, dry, and hazardous.

It sounds like a tiny habit. But over time, it has made a huge difference.

For the past six years, not even one bag of garbage from this colony has gone to a landfill.