1 Substance abuse. Abuse of drugs and alcohol can contribute to panic disorder.  Major life stress. Stressful events and major life transitions, such as the death of a loved one, can sometimes trigger panic attacks, which can potentially recur and go on to become panic disorder.
Zero emission refers to an engine, motor, process, or other energy source, that emits no waste products that pollutes the environment or disrupts the climate. Contents.
When natural gas is used directly, then from the place where it is extracted from the ground, to appliances in your home, natural gas achieves 92 percent energy efficiency. An Emissions Solution in Your City. Natural gas is the cleanest alternative transportation fuel available. Compared with diesel and gasoline, natural gas can reduce greenhouse gas emissions by 20 to 30 percent. The exhaust emissions of natural gas vehicles, when compared to those of gasoline and diesel vehicles, offer ...