Greenhouse workers are exposed to unique environmental conditions that include enclosed spaces, high temperature, high humidity and elevated levels of airborne microorganisms. A research study conducted in the month of July found an increased prevalence of respiratory symptoms (cough, wheeze and phlegm) among workers employed in 3 Midwestern greenhouses. This is an example of a:

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Explanation:

The long term effective management of the natural environment, requires a detailed understanding of greenhouse gases. This has both environmental and economic implications, especially where there is any anthropogenic involvement or not. Like in this scenario they are group of workers in the same environment and exposed to the same airborne microorganism, having same deseases symptoms.