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Lee argues that EJ practice has long stagnated over an inability to properly define the concept of disproportionate (environmental and public health) impacts, but that national conversations on system racism and the development of EJ mapping tools have improved his outlook on the potential for better application of the concept of disproportionate impact. Lee identifies mapping tools (e.g. CalEnviroScreen) as a pathway for empirically based and analytically rigorous articulation and analysis of disproportionate impacts that are linked to systemic racism. In describing the scope and nature of application of mapping tools, Baker highlights the concept of cumulative impacts (the concentration of multiple environmental, public health, and social stressors), the importance of public participation (e.g. Hoffman’s community science model), the role of redlining in creating disproportionate vulnerabilities, and the importance of integrating research into decision making processes. Baker ultimately argues that mapping tools offer a promising opportunity for integrating research into policy decision making as part of a second generation of EJ practice. Key areas that Lee identifies as important to the continued development of more effective EJ practice include: identifying good models for quantitative studies and analysis, assembling a spectrum of different integrative approaches (to fit different contexts), connecting EJ research to policy implications, and being attentive to historical contexts and processes that produce/reproduce structural inequities.

The evidence is somewhat based on the findings of an issue of "American Anthropologist". A research project from the NIH is also a basis for evidence. Individuals that were involved with and impacted by Katrina also shared their stories.

I further investigated details on the cost of a trailer home, the population changes over the past few years in New Orleans, and images of the city before and after Katrina.

A variety of sources were used to make this article, as seen in the bibliography. The authors referenced many US government documents, news and research articles, recovery programs, research on other disasters, and various other works. This shows that the authors were not narrow-minded in their research, they looked for many points of view and other evidence for the article.