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Most theoretical perspectives on neighborhood effects on youth assume that neighborhood context serves as a source of socialization. The exact sources and processes underlying adolescent socialization in disadvantaged neighborhoods, however, are largely unspecified and unelaborated. This article proposes that cross-cohort socialization by older neighborhood peers is one source of socialization for adolescent boys. Data from the National Educational Longitudinal Survey suggest that adolescents in disadvantaged neighborhoods are more likely to spend time with older individuals. I analyze qualitative interview data from 60 adolescent boys in three neighborhoods in Boston to understand the causes and consequences of these interactions and relationships. Some of the strategies these adolescents employ to cope with violence in disadvantaged neighborhoods promote interaction with older peers, particularly those who are most disadvantaged. Furthermore, such interactions can expose adolescents to local, unconventional, or alternative cultural models.

This article investigates the causal effects of neighborhood on high school dropping out and teenage pregnancy within a counterfactual framework. It shows that when two groups of children, identical at age 10 on observed factors, experience different neighborhoods during adolescence, those in high-poverty neighborhoods are more likely to drop out of high school and have a teenage pregnancy than those in low-poverty neighborhoods. Causal inferences from such associations have been plagued by the possibility of selection bias. Using a new method for sensitivity analysis, these effects are shown to be robust to selection bias. Unobserved factors would have to be unreasonably strong to account for the associations between neighborhood and the outcomes. 10 Tables, 2 Figures, 84 References. (Original abstract - amended)

Lidar and optical satellite observations of Amazon forests indicate consistent canopy structure and reflectance during the dry season, challenging the paradigm of light-limited tropical forest productivity. 'Greener' Amazon was a trick of the light Recent remote-sensing data from the Amazon suggested that there is a 'green up' of vegetation during dry seasons, implying that light rather than water is the major limiting factor for forest productivity. Douglas Morton and colleagues have now reanalysed the evidence and show that the green up is in fact an optical artefact of the observation method, the result of changes in the relative azimuth angle of satellite observations between the June solstice and September equinox. Correcting for this removes the green-up phenomenon, adding support to other studies that indicate that water availability, rather than light, is the main driver of plant productivity in Amazon forests. The seasonality of sunlight and rainfall regulates net primary production in tropical forests 1 . Previous studies have suggested that light is more limiting than water for tropical forest productivity 2 , consistent with greening of Amazon forests during the dry season in satellite data 3 , 4 , 5 , 6 , 7 . We evaluated four potential mechanisms for the seasonal green-up phenomenon, including increases in leaf area 5 , 6 , 7 or leaf reflectance 3 , 4 , 6 , using a sophisticated radiative transfer model 8 and independent satellite observations from lidar and optical sensors. Here we show that the apparent green up of Amazon forests in optical remote sensing data resulted from seasonal changes in near-infrared reflectance, an artefact of variations in sun-sensor geometry. Correcting this bidirectional reflectance effect eliminated seasonal changes in surface reflectance, consistent with independent lidar observations and model simulations with unchanging canopy properties. The stability of Amazon forest structure and reflectance over seasonal timescales challenges the paradigm of light-limited net primary production in Amazon forests and enhanced forest growth during drought conditions. Correcting optical remote sensing data for artefacts of sun-sensor geometry is essential to isolate the response of global vegetation to seasonal and interannual climate variability.

Abstract Although there is some evidence of declining intergenerational mobility in wealthy countries, the sources of these changes are not well understood. This paper examines the changes in intergenerational mobility in Denmark, which has one of the highest levels of intergenerational mobility in the world. We show that mobility has been declining for both men and women since the late 1950s across the most recent cohorts who are now old enough to measure permanent adult income, and that these changes were concentrated among children born into the middle three-fifths of the income distribution. We examine the sources of this decline by testing hypotheses related to demographic processes, returns to education, and work experience. Our results highlight the importance of both parent and child work experience and family structure in the family of origin among both men and women as well as, to a lesser degree, marital status, assortative mating, and childbearing among women. Although education was an important driver of parent-child income rank associations (IRA) in each cohort, it played little role in accounting for increases in those associations across cohorts.

How might parole operate as a labor market institution, and how might it contribute to the governance of poverty and social marginality? Drawing on a series of correctional, employment, and arrest records for a cohort of parolees in Michigan, we show that parole generally supervises a jobless population, but also oversees a significant number of people who work. We also find evidence that parole, contrary to many expectations, increases the odds of employment. However, we do not find convincing evidence that parolee employment alleviates individual poverty or reduces the odds of recidivism. These results inspire a conceptualization of parolefare, another poverty regulating regime that successfully motivates worker-citizenship but does little to extend or protect the life chances of the poor.

The United States has experienced dramatic increases in both incarceration rates and the population of insecurely housed or homeless persons since the 1980s. These marginalized populations have strong overlaps, with many people being poor, minority, and from an urban area. That a relationship between homelessness, housing insecurity, and incarceration exists is clear, but the extent and nature of this relationship is not yet adequately understood. We use longitudinal, administrative data on Michigan parolees released in 2003 to examine returning prisoners' experiences with housing insecurity and homelessness. Our analysis finds relatively low rates of outright homelessness among former prisoners, but very high rates of housing insecurity, much of which is linked to features of community supervision, such as intermediate sanctions, returns to prison, and absconding. We identify risk factors for housing insecurity, including mental illness, substance use, prior incarceration, and homelessness, as well as protective “buffers” against insecurity and homelessness, including earnings and social supports.

Theory suggests that neighborhood effects depend not only on where individuals live today, but also on where they lived in the past. Previous research, however, usually measures neighborhood context only once and does not account for length of residence, thereby understating the detrimental effects of long-term neighborhood disadvantage. This study investigates effects of duration of exposure to disadvantaged neighborhoods on high school graduation. It follows 4,154 children in the Panel Study of Income Dynamics, measuring neighborhood context once per year from age 1 to 17. The analysis overcomes the problem of dynamic neighborhood selection by adapting novel methods of causal inference for time-varying treatments. In contrast to previous analyses, these methods do not \"control away\" the effect of neighborhood context operating indirectly through time-varying characteristics of the family; thus, they capture the full impact of a lifetime of neighborhood disadvantage. We find that sustained exposure to disadvantaged neighborhoods has a severe impact on high school graduation that is considerably larger than effects reported in prior research. We estimate that growing up in the most (compared to the least) disadvantaged quintile of neighborhoods reduces the probability of graduation from 96 to 76 percent for black children, and from 95 to 87 percent for nonblack children.

Since the mid-1970s, the United States has experienced an enormous rise in incarceration and accompanying increases in returning prisoners and in postrelease community correctional supervision. Poor urban communities are disproportionately impacted by these phenomena. This review focuses on two complementary questions regarding incarceration, prisoner reentry, and communities: (a) whether and how mass incarceration has affected the social and economic structure of American communities, and (b) how residential neighborhoods affect the social and economic reintegration of returning prisoners. These two questions can be seen as part of a dynamic process involving a pernicious feedback loop in which mass incarceration undermines the structure and social organization of some communities, thus creating more criminogenic environments for returning prisoners and further diminishing their prospects for successful reentry and reintegration.