Large-scale fires can lead to a decrease in atmospheric carbon dioxide.

False. 

The phrase should be Large-scale fires can lead to a INCREASE in atmospheric carbon dioxide.

Large-scale fires can exhaust a vast amount of carbon dioxide to the atmosphere which increases the greenhouse effect which has been readily enhanced by man-made structures then contribute to air pollution. 

The scientific method is a series of steps followed by scientific investigators to answer specific questions about the natural world. it involves making observations, formulating a hypothesis, and conducting scientific experiments.the steps of the scientific method are •observation-the first step of the scientific method involves making an observation about something that interests you•question-once you've made your observation, you must formulate a question about what you have observed. •hypothesis-once you've made your observation, you must formulate a question about what you have observed. •experiment-once you've developed a hypothesis, you must design and conduct an experiment that will test it.•results-the results are where you report what happened in the experiment. •conclusion-the final step of the scientific method is developing a conclusion.i hope that this you : )