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 is present throughout the natural environment in many forms. Carbon is present in the air as carbon dioxide, and contributes to the Greenhouse Effect and global warming. Efforts are being made to reduce the amount of carbon dioxide in the atmosphere to counter this effect. Carbon is a building block of life and a form of stored energy.