Generosity for children, from wartime schooling to music education

In more cases of leading by example, San Francisco is teaching other cities how its well-established composting program works. And in southeastern Africa, women have been patiently reforesting the shoreline with mangroves for 15 years.

1. United States

The city conducted a “waste characterization” study in 1996 that showed a third of the refuse could be composted, which experts say is one of the simplest, most low-tech ways to combat climate change by reducing methane production. More than 500 tons of compost are collected each day, eliminating around 80% of waste from landfills.