Is there any good or bad effect of eclipses to environment and to us​

During a solar eclipse the radiation of the Sun decreases, which takes an effect to the environment, included but not limited to the temperature change. We can use the collected temperature data from different land covers to analyze the diversity of temperature decreases.

The answer to this question is Confounding variables
Confounding variables often created to the failure in control by the researchers that will eventually damage the validity of the research.
For example, if researchers are finding the correlation between tofu consumption and breast cancer, the gene that improve the chance of causing cancer could be considered as confounding variables.