Salvatorian nuns build houses for war victims, widows in Sri Lanka

The philanthropic practice of buy-one-give-one can be ineffective if communities are given ill-fitting donations or if the donations supplant local markets. The company Warby Parker ensures lasting change by financing the means of local production of a pair of glasses for every pair bought.

In a county in California, federal agencies are implementing a model known as Housing First which gets homeless people safe, secure housing before tackling root causes of homelessness.

By partnering with cities across America, the 100,000 Homes campaign is going directly to the streets to end homelessness - and it’s working. With roughly 700,000 people in the United States experiencing homelessness, this organization seeks to address that using a tiered system that considers individual health needs as well.

At least 25 percent of female veterans were sexually abused in childhood, making it more difficult to reenter civilian life. Volunteers of America runs a holistic housing program for homeless veterans in the U.S.

Female veterans are more likely to have a history of trauma, be unemployed, and be homeless. To address this disparity, the VA has started awarding grants to organizations that help female vets.

New Orleans implemented an extraordinary 10-year plan that engaged unprecedented cross-sector collaboration between government, non-profit, and private entities to provide housing and housing services to the city's homeless veterans. The city's success in providing homes for every single veteran formerly on their streets motivated cities across the nation to tackle the crises using similar means, leading to a 1/3 decline veteran homelessness since 2010.

New crowdfunding options can help even the smallest donor's contributions to have a meaningful impact, bolstering a sense of personal involvement, maximizing knowledge about causes, and inspiring greater participation.

San Francisco's Care Not Cash program began in 2004 in response to the city's homelessness crisis. One facet of the program is an outreach team, whose members regularly visit homeless people on the street to connect them to resources such as housing and drug rehabilitation.

For most well-meaning donors, it can be difficult to calculate which charities are most effective with their funding - that is those that aim to solve the most serious problems, use interventions that work, employ cost-effective strategies, are competent and honest, and can make good use of each additional dollar. Organizations like GiveWell are part of a new and welcome trend toward rigorous evaluation of social change programs, and helps people best decide where to donate based on what causes matter to them most.

To combat rampant homelessness, cities like New York are investing in supportive housing and comprehensive, consistent services for the homeless population. Although San Francisco has smaller-scale supportive housing programs. political will and regular funding are necessary to grow those initiatives and make a large impact on homelessness in the city.