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The construction sector delivers the infrastructure and buildings to the society by consumption large amount of unrenewable energy. Consequently, this consumption causes the large emission of CO₂. This paper explores and compares the level of CO₂ emission caused by the construction activities globally by using the world environmental input-output table 2009. It analyses CO₂ emission of construction sector in 40 countries, considering 26 kinds of energy use and non-energy use. Results indicate: 1) the total CO₂ emission of the global construction sector was 5.7 billion tons in 2009, contributing 23% of the total CO₂ emissions produced by the global economics activities. 94% of the total CO₂ from the global construction sector are indirect emission. 2) Gasoline, diesel, other petroleum products and light fuel oil are four main energy sources for direct CO₂ emission of global construction sector. The indirect CO₂ …