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to human activities. Thirdly, human activities and climatic drivers impact vegetation ecosystem changes at different rates. Finally, desertification manifests as a gradual change in ecosystem composition and structure e.g., woody shrub invasion into grasslands. Although initiated at a limited location, ecosystem change may propagate throughout an extensive area via a series of feedback mechanisms. This complicates the attribution of desertification to human and climatic causes, as the process can develop independently once started. Saline and sodic soils occur naturally in arid, semi-arid and dry sub-humid regions of the world. Climate change or hydrological change can cause soil salinisation by increasing the mineralised groundwater level. However, secondary salinisation occurs when the concentration of dissolved salts in water and soil is increased by anthropogenic processes, mainly through poorly managed irrigation schemes. The threat of soil and groundwater salinisation induced by sea level rise and seawater intrusion are amplified by climate change Section 7. Also, estimates of risk may be derived from biomarkers which may be monitored in people exposed to soil pollution. Such biomarkers have emerged from epidemiological studies considering the combined effect of substances. An illustration thereof is the study by Lee which found a graded association of the concentration of blood lead and urinary cadmium concentrations with oxidative stress related markers in the US population. This suggests that oxidative stress may be useful as a biomarker for combination effects. It has furthermore been proposed to evaluate effects of exposure to nitroarenes by measuring haemoglobin adducts , and of mixtures of volatile organochlorines by measuring glutathione conjugative metabolites . Bioassays based on aryl hydrocarbon receptor mediated mechanisms have been proposed which will allow a better alternative to the measurement of polyhalogenated aromatic hydrocarbons . Another option is to estimate risks to human health by taking into account cumulative combination effects in line with established cause-effect relations and research into the effects of actual combinations. It has been shown that risks of compounds with the same targets and the same modes of action may be estimated on the basis of concentration addition, while including toxicity equivalence factors for the compounds involved . salmon in the Central Valley, but more comparable to the number of steelhead returns. In addition, steelhead, Atlantic salmon, and coho salmon typically spend a year or more as juveniles in freshwater before migrating to the ocean, whereas Central Valley Chinook juveniles typically spend less than a year. The committee cautions against applying results from one species to another without careful consideration of potential differences between them, and reiterates the difficulty of confidently ascribing observed changes in salmonid populations to

tropical flower kansas city chiefs summer hawaiian shirt 2
tropical flower kansas city chiefs summer hawaiian shirt 2

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