Answer:
Ever since "Observations throughout the world make it clear that climate change is occurring, and rigorous scientific research demonstrates that the greenhouse gases emitted by human activities are the primary driver." (2009)2
Explanation:
Considering the available options, the discovery responsible for the shift from rural to urban population is the "<u>Electricity</u>."
<h3>What is Shift from Rural to Urban Population?</h3>
The Shift from Rural to Urban population is the increase in the population of the urban centers due to migration from the rural areas.
Following the discovery of electricity, there is a rise in industrialization, thereby leading to people migrating from rural areas to urban areas to get jobs and live better lives.
Hence, in this case, it is concluded the correct answer is option D. "Electricity."
Learn more about the impact of electricity here: brainly.com/question/16620781
B. Tsunamis
This is because the ring of fire is referring to Volcanoes, and the only thing volcanoes can cause on that list is Tsunamis.
Ozone layer depletion was not noticed until 1979, while CFC’s have been around since 1920s because CFCs take time to enter the stratosphere and remain there for at least 60 years after their initial release.
Option: A
Explanation:
Ozone layer is found in stratosphere. Ozone plays a dual role in the environment. When it is in the ground surface zone it is a harmful gas but when its in the atmosphere it is a life saving layer which absorbs UV rays and protect human beings and animals from the harmful affect of poisonous gases.
Though ozone layer started depleting from 1920. But it came into notice from 1979 as CFCs take time to enter the stratosphere and remain there for at least 60 years after their initial release.
