Of coalâs many environmental impacts, none are as harmful, long term, and irreversible as global warming. Global warming is driven by emissions of heat-trapping gases, primarily from human activities, that rise into the atmosphere and act like a blanket, warming the earthâs surface.
An executive officer (often abbreviated XO) is generally a person responsible for running an organization, although the exact nature of the role varies depending on the organization. Contents.he US Air Force uses the term executive officer for officers assigned as personal staff officers to general officers. Their role is similar to aides-de-camp in the US Army, Marine Corps and Air Force and flag aides and flag lieutenants in the US Navy and Coast Guard.
Definition of executive for Students. 1  1 : fitted for or relating to the managing or directing of things Claudia showed the executive ability of a corporation president. 2  2 : relating to the carrying out of the law and the conduct of public affairs the executive branch of government.