Abstract
Climate change alters different localities on the planet in different ways. The impact on each region depends mainly on the degree of vulnerability that natural ecosystems and human-made infrastructure have to changes in climate and extreme meteorological events, as well as on the coping and adaptation capacity toward new environmental conditions. This study assesses the current resilience of Mexico and Mexican states to such changes, as well as how this resilience will look in the future. In recent studies (Moss et al. in Vulnerability to climate change: a quantitative approach. Pacific Northwest National Laboratory, Washington DC, 2001; Brenkert and Malone in Clim Change 72:57–102, 2005; Malone and Brenkert in Clim Change 91:451–476, 2008), the Vulnerability–Resilience Indicators Model (VRIM) is used to integrate a set of proxy variables that determine the resilience of a region to climate change. Resilience, or the ability of a region to respond to climate variations and natural events that result from climate change, is given by its adaptation and coping capacity and its sensitivity. On the one hand, the sensitivity of a region to climate change is assessed, emphasizing its infrastructure, food security, water resources, and the health of the population and regional ecosystems. On the other hand, coping and adaptation capacity is based on the availability of human resources, economic capacity, and environmental capacity. This paper presents two sets of results. First, we show the application of the VRIM to determine state-level resilience for Mexico, building the baseline that reflects the current status. The second part of the paper makes projections of resilience under socioeconomic and climate change and examines the varying sources and consequences of those changes. We used three tools to examine Mexico’s resilience in the face of climate change, i.e., the baseline calculations regarding resilience indices made by the VRIM, the projected short-term rates of socioeconomic change from the Boyd–Ibarrarán computable general equilibrium model, and rates of the IPCC-SRES scenario projections from the integrated assessment MiniCAM model. This allows us to have available change rates for VRIM variables through the end of the twenty-first century.
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In general, varying input parameter best-estimate values 2% and propagating the variances around the parameters through a model is a way of testing the structure of a model. Mean output values resulting from such a tests are, by definition, very similar to the deterministic output. The effects of model structure can be analyzed by regressing the output values as dependent variables, against the sampled input parameters as independent variables (e.g., Rose et al. 1991). Those parameters explaining most of the variance of the output can thus be identified. Stratified Latin Hypercube sampling of the parameters ensures that each of the input parameters has its total predefined sampling range represented, because the procedure consists of dividing the range of each parameter into N strata of equal marginal probability 1/N and sampling once from each stratum with N = 1,000 in our case. Each of the N samples from each of the parameter values are then combined in a random manner and the indicators calculated a thousand times. This type of sampling avoids spurious correlations among parameters. When parameters are sampled from distributions representing their estimated actual uncertainty, i.e., from a variance larger than the 2% coefficient of variation, their impacts on the final model outputs change and different parameters contribute more or less to the uncertainty of the outputs depending both on model structure and uncertainties of the parameters. This, again, can be analyzed through ordinary least-squares regression (e.g., Gardner et al. 1983; Moss et al. 2001).
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Ibarrarán, M.E., Malone, E.L. & Brenkert, A.L. Climate change vulnerability and resilience: current status and trends for Mexico. Environ Dev Sustain 12, 365–388 (2010). https://doi.org/10.1007/s10668-009-9201-8
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DOI: https://doi.org/10.1007/s10668-009-9201-8