The ozone layer is facing serious problems that are caused by humans. There are many human causes and natural causes. In this paragraph, I am going to write about these causes. The first cause is human activities, because of it the concentration of carbon dioxide has increased. Another cause is combustion of fossil fuels and it has also increased the concentration of carbon dioxide. Yet another cause is pollution and it produces CO2 which has a lot of dangers in our life. Natural causes are causes created by nature. One natural cause is a release of methane gas from wetlands. Methane is a greenhouse gas. A greenhouse gas is a gas that traps heat in the earth's atmosphere. Another natural cause is that the earth goes through a cycle of climate change. This climate change usually lasts about 40,000 years.
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