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- All Subjects: Arizona
- Creators: School of Sustainability
Since the 1980’s, there has been a growing interest in the concept of sustainability. The prime directive of sustainability is to balance the needs of economics, environmental health, and human society. The change in the global climate, loss of biodiversity, increased levels of pollution, and general trend toward resource scarcity have all increased the momentum of the contemporary sustainability movement. Simultaneously, poverty and nutrition scarcity have attracted many to sustainability’s principles of resource equity. What one can gather from the diversity of sustainability’s intended functions is that it’s meant to solve several problems at once. In another sense, the most impactful sustainability solutions are multipurpose. This is not to say that any given solution is a panacea. On the contrary, sustainability advocates often dispute the existence of so-called “silver bullets” for these global issues. While this tends to reign true, it does not stop policy makers, communities, or researchers from attempting to employ multifaceted solutions. One such example is the myriad of sustainability issues associated with industrial agriculture. With the compounding issues of high water consumption, habitat destruction via land use change, biodiversity loss and climate change, industrial agriculture appears to be a damaging system. Areas like Arizona are projected to be affected by many of these issues. It thus stands to reason that if Arizona is to aggressively address its long-term drought, as well as global sustainability issues, a systematic change in farming practices needs to be made. Firstly, an analysis of the agricultural and water histories of Arizona will highlight the events most relevant to the region’s contemporary issues. Following this, the analysis will frame the greater problem through specific pieces of evidence associated with water scarcity in Arizona. Then, a summary of findings will illustrate the fundamental theories surrounding regenerative agriculture and three of its alternative forms: permaculture, dryland farming, and carbon farming. These theories will be instrumental in recommending a useful conception of regenerative agriculture for Arizona; it will be known as a Regenerative Dryland Farming System (RDFS). The extent and utility of current solutions will then be explored. The remainder of the section will illustrate the principles of the RDFSs, explore their potential weaknesses, and recommend policy for their successful deployment. Overall, it will be argued that RDFSs should fully replace industrial agriculture in Arizona. This will be vital in addressing the nine planetary boundaries and freshwater reality of the region.
Summer daytime cooling efficiency of various land cover is investigated for the urban core of Phoenix, Arizona, using the Local-Scale Urban Meteorological Parameterization Scheme (LUMPS). We examined the urban energy balance for 2 summer days in 2005 to analyze the daytime cooling-water use tradeoff and the timing of sensible heat reversal at night. The plausibility of the LUMPS model results was tested using remotely sensed surface temperatures from Advanced Spaceborne Thermal Emission and Reflection Radiometer (ASTER) imagery and reference evapotranspiration values from a meteorological station. Cooling efficiency was derived from sensible and latent heat flux differences. The time when the sensible heat flux turns negative (sensible heat flux transition) was calculated from LUMPS simulated hourly fluxes. Results indicate that the time when the sensible heat flux changes direction at night is strongly influenced by the heat storage capacity of different land cover types and by the amount of vegetation. Higher heat storage delayed the transition up to 3 h in the study area, while vegetation expedited the sensible heat reversal by 2 h. Cooling efficiency index results suggest that overall, the Phoenix urban core is slightly more efficient at cooling than the desert, but efficiencies do not increase much with wet fractions higher than 20%. Industrial sites with high impervious surface cover and low wet fraction have negative cooling efficiencies. Findings indicate that drier neighborhoods with heterogeneous land uses are the most efficient landscapes in balancing cooling and water use in Phoenix. However, further factors such as energy use and human vulnerability to extreme heat have to be considered in the cooling-water use tradeoff, especially under the uncertainties of future climate change.