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.
EXECUTIVE SUMMARY. In the coming decades, a full transition to zero emission transportation technologies across all sectors of the vehicle. fleet, running on increasing amounts of clean, non-combustion renewable electricity or hydrogen sources (e.g. wind, solar), is needed to support clean air and a healthy climate.