Origin of Oxygen to Human Impact
History of João Neves - Paraiba, Brasil
The oxygen generated by these living beings slowly accumulated in the atmosphere, which changed its composition and created, around 400 million years ago, the conditions necessary for the formation of an ozone layer. This layer is capable of filtering ultraviolet radiation, thus allowing living beings to colonize terrestrial environments outside of water.
The enrichment of the atmosphere with oxygen, produced in photosynthesis, allowed this gas to become available and be used by living beings in cellular respiration, which in turn releases the carbon dioxide consumed in photosynthesis into the atmosphere.
The Earth's atmosphere has undergone continuous changes in its composition over geological time, responsible for drastic climate changes and mass extinctions. Currently, it is human activities that produce a growing and global impact on the atmosphere with consequences that are still difficult to predict.
The enrichment of the atmosphere with oxygen, produced in photosynthesis, allowed this gas to become available and be used by living beings in cellular respiration, which in turn releases the carbon dioxide consumed in photosynthesis into the atmosphere.
The Earth's atmosphere has undergone continuous changes in its composition over geological time, responsible for drastic climate changes and mass extinctions. Currently, it is human activities that produce a growing and global impact on the atmosphere with consequences that are still difficult to predict.
