The Mexican women who kicked out the cartels

In the past, Los Angeles was a dangerous city fraught with gang wars. Lately, though, LA has become a safer city due to six changes enforced by the police cracking down on public violence and gangs.

Evidence continues to build that humans are contributing to a climate change issue that is nothing but bad news for the planet. Hopeful stories from seven countries, including India, Indonesia, and China, show that efforts to combat climate change might finally be working.

Summer in the Northwest presents a great risk of wildfires. A pile burning operation, just one facet of the strategy that Oregon has enacted to conserve its forests, clears undergrowth to lessen the risk of mega-fire. The work stimulates the local economy and provides employment, but it's also a very small part of what needs to be done.

Geography and climate change challenge the viability of sea-level cities in Vietnam, but architects, researchers, and urban planners work together to find creative solutions. One architect in Ho Chi Minh City designed green roofs to absorb the rainwater that causes floods.

In Africa, many people rely on wood from trees to cook food over stoves. The tremendous usage of wood contributes to deforestation and environmental decline. Using bamboo instead of wood is a more profitable and greener solution.

In Iowa, the “redistricting” of the state’s legislative and congressional boundaries is done by mapmakers who abide by nonpartisan metrics that all sides agree are fair — a seemingly revolutionary concept in the high-stakes decennial rite of redistricting.

The Center for Applied Nonviolent Action and Strategies provides a "blueprint" for peaceful and democratic revolution, busting myths about the process of nonviolent revolt and helping dissidents in countries around the world to accomplish political goals, such as fighting corruption or protecting the environment.

Palm Beach County, Florida has many of the same social problems that Philadelphia has, including “gangs, drugs, and poverty.” However, their school system has managed to keep students safe by employing “safe-school case managers” who build relationships with students, and they offer a youth court that is a system run by students who peer-review cases of unrest. The initiatives in this county has prevented school violence from happening without metal detectors and just two police officers.

Crushing poverty and extreme violence - fueled by drug trafficking and police corruption - are behind a mass migration of Central American children to the United States in recent months that has overwhelmed U.S. border resources and driven illegal immigration to the fore in U.S. congressional elections. But the United Nations has praised Nicaragua's security model, which includes social services to help youths in gangs find jobs as well as sport programs like little-league baseball teams.

Two columns on how Iran is treating its massive epidemic of injecting drug use by tackling it as a health problem, effectively lowering H.I.V. rates among drug users using an approach to drugs known as harm reduction.