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.
Soon, they'll have to work even harder to meet them. Under California's zero-emission vehicle mandate, a certain percentage of an automaker's sales must be ZEVs. Automakers have been able to use partial credit from sales of hybrids and low-emissions conventional vehicles toward their ZEV quotas.