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Xinhuanet, Beijing, January 22: A Norwegian scientist recently stated that due to the development of global industrialization, emissions of carbon dioxide, the main greenhouse gas on the earth, have increased significantly, causing the concentration of carbon dioxide in the atmosphere to reach a record high. According to Reuters, Kim Holmen, director of the Norwegian Polar Institute, said that results measured by a Norwegian Arctic research station showed that the concentration of carbon dioxide, the main greenhouse gas in the atmosphere, at the beginning of 2008 was about 394ppm, 1.5ppm higher than the previous record (1ppm is one part per million). Holmen said that with the increase in the use of fossil fuels in power stations and factories, carbon dioxide concentrations have increased by nearly one-third compared with the early days of the industrial revolution in the 18th century, and current international efforts to reduce carbon dioxide emissions are of no avail. In the Northern Hemisphere, carbon dioxide concentrations typically peak before spring and then begin to decrease as plant growth absorbs carbon dioxide. Holmen believes there will be a small increase in carbon dioxide levels over the next few weeks. Greenhouse gases are a major contributor to global warming. In addition to carbon dioxide, methane and nitrous oxide are also common greenhouse gases. United Nations * * The Intergovernmental Panel on Climate Change stated that by 2015, the world's greenhouse gas emissions will reach their highest level, and the biggest impact of global warming will not only be more droughts and floods, but also rising sea levels.