Labor certification is  a United States of America immigration process step. Its stated goal is to protect U.S. workers and the U.S. labor market by ensuring that foreign workers seeking immigrant visa classifications are not displacing equally qualified U.S. workers..
How are local winds and global winds differ? local winds-are winds that blow over short distances caused by unequal heating of the earths surface in a small area. global winds-are winds that blow around the earth from â¦ the north pole to the south pole.
Local winds are caused by small convection currents and global  winds are caused by large convection winds. All wind is caused by  the uneven heating of Earth's surface, whiâ¦ch sets convection  currents in motion. Answered by The WikiAnswersÂ® Community. Making the world better, one answer at a time. Global winds are caused by the unequal heating of the Earth's surface and by the rotation of the Earth. Global winds are caused by the unequal heating of the Earth's surface and by the rotation of the Earth.