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.
From the biological point pollution can be of two types biodegradable and non-degradable pollutants. The degradable pollutants are those which can be degraded, decomposed, removed or reduced to acceptable limits either by the natural processes or by man-made systems like the sewage treatment plants.iodegradable pollutants are those that can be broken down into simple elements and substances by the action of bacteria and other decomposers. These pollutants are degraded slowly by microbes.