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.
Carbon enters, is stored, and leaves the different spheres of the Earth through different methods, and in different quantities: Atmosphere; carbon is stored in the atmosphere as both methane (CH4) and carbon dioxide (CO2); greenhouse gases which absorb and retain heat. CO2 is released into the atmosphere through respiration by living organisms, volcanic eruptions, weathering, and human activity.