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In that vein, theories are formulated in accordance with most of the same scientific rules as hypotheses. In addition to testing hypotheses, scientists can also generate a model, an attempt to explain or depict the phenomenon when it comes to a logical, physical or mathematical representation and to generate new hypotheses that may be tested, based mostly on observable phenomena. Harmful environmental points similar to ozone depletion, acidification, eutrophication and climate change got here to the public's attention in the identical period, and triggered the onset of environmental science and environmental expertise. In the primary half of the century, the event of antibiotics and synthetic fertilizers made international human population progress possible. At the same time, the construction of the atom and its nucleus was found, leading to the discharge of "atomic power" . In addition, the intensive use of technological innovation stimulated by the wars of this centur