In the last 100 years, which of the following have added excess carbon dioxide to the atmosphere? a. power plants c. cars b. machinery d. all of the above

The correct answer is D. All of the above.

Explanation

During the last hundred years, science has advanced by leaps and bounds; although this has had a negative impact on the environment. This process began in the Industrial Revolution during the eighteenth century, in this period, factories began to implement the use of machinery that worked with steam, or coal. Also, the train that used coal to work was created. Since this time carbon dioxide emissions increased due to the burnt of fossil fuels that release carbon dioxide to the atmosphere. Later with the development of power plants where they burn wood and other materials to obtain energy, this gas increased. Besides, with the development of the gasoline engine, the automotive industry advanced; however, the gas emissions produced by the combustion of gasoline have contributed high doses of carbon dioxide to the Earth's atmosphere. So, the correct answeri s D. All of the above.

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