Atmosphere of Earth the border between the atmosphere and outer space. Atmospheric effects become noticeable during atmospheric reentry of spacecraft at an altitude of around . Several layers can be distinguished in the atmosphere, based on characteristics such as temperature and composition. The study of Earth's atmosphere and its processes is called atmospheric science (aerology). Early pioneers in the field include Léon Teisserenc de Bort and Richard Assmann. The three major constituents of Earth's atmosphere are nitrogen, oxygen, and argon. Water vapor accounts for roughly 0.25% of the atmosphere by mass. The concentration of water vapor (a greenhouse gas) varies significantly from around
Oil and gas industry in the United Kingdom activities for as long as they remain, and to make this data available for use by fishing vessel plotters found on board in wheelhouses all around the UK coastline. The industry's vision which guides the environmental management process is to understand and manage environmental risks to achieve demonstrable no harm levels by 2020. UK oil and gas installations participate in the European Union Emission Trading Scheme (EU ETS) which aims to reduce emissions of carbon dioxide and combat the threat of climate change. Carbon dioxide is released into the atmosphere in three ways during production operations: combustion of fuel for