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.
Electricity generate and Transportation fossil fuel combustion generates 70% of U.S electricity, and coal accounts for most of the resulting emission.Product fewer emissions per unit energy generated.we can also reduce greenhouse gas emissions by switching to cleaner energy sources.