Soil Black Carbon Increases Under Urban Trees with Road Density and Time: Opportunity Hotspots for Carbon Storage in Urban Ecosystems.

Black carbon (BC) can comprise a significant fraction of the soil carbon pool in cities. However, vegetation cover and human activity influence the spatial distribution of urban soil BC. We quantified soil total carbon (TC), soil organic carbon (SOC), BC, and total nitrogen (TN) in a medium-sized city in Dallas-Fort Worth, Texas.

Pivoting is exhausting: A critical analysis of local food system resilience.

As COVID-19 caused severe disruptions to global supply chains in March 2020, local and regional food producers were widely heralded for their flexibility in adapting and 'pivoting' to meet changing market demand amidst public health protocols in ways their behemothic agri-food counterparts could not. While "resilient food systems" have become both an academic buzzword and a practical goal for urban and municipal planners, there is an emergent critical literature that calls for greater attention to questions of power within discourses on resilience. This article contributes to a more critical geography of food system resilience through analyzing the experiences of local food producers and meat processors in the state of Iowa, U.

Comment on "Redefining the age of Clovis: implications for the peopling of the Americas".

Waters and Stafford (Reports, 23 February 2007, p. 1122) provided useful information about the age of some Clovis sites but have not definitively established the temporal span of this cultural complex in the Americas. Only a continuing program of radiometric dating and careful stratigraphic correlations can address the lingering ambiguity about the emergence and spread of Clovis culture.