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 Dioxide. Carbon dioxide is probably the most important of the greenhouse gases as it accounts for the largest proportion of the 'trace gases' and is currently responsible for 60% of the 'enhanced greenhouse effect'.n the atmosphere today. Atmospheric carbon dioxide comes from a number of natural sources, mainly the decay of plants, volcanic eruptions and as a waste product of animal respiration. It is removed from the atmosphere by photosynthesis in plants and by dissolving in water, especially on the surface of oceans.