Stuttering occurs when the natural flow of speech is interrupted. When the child involuntarily prolongs sounds, is unable to produce certain sounds, or repeats a sound, we can say he or she is at risk for stuttering. Stuttering will usually begin between the ages of three and six.
It is significant that so much carbon dioxide stays in the atmosphere because CO 2 is the most important gas for controlling Earthâs temperature. Carbon dioxide, methane, and halocarbons are greenhouse gases that absorb a wide range of energyâincluding infrared energy (heat) emitted by the Earthâand then re-emit it.
During the natural carbon cycle, carbon is released into the atmosphere from various sources and absorbed through sinks.. For example humans and plants give off carbon dioxide through respiration, making them a source of carbon dioxide, while plants absorb carbon dioxide during photosynthesis, making them a sink.uman contributions. While a certain amount of the carbon dioxide in our atmosphere is created through natural processes like respiration, wildfires, and volcanic activity, human activity is a the largest source of global CO 2 emissions.