Low-carbon, English is low carbon. Means lower (lower) greenhouse gas (carbon dioxide-based) emissions. With the development of the industrial economy in the world, the dramatic increase in population, the infinite increase of human desires and the uncontrolled production and lifestyle, the world climate is facing more and more serious problems with an increasing amount of carbon dioxide emissions and the earth's ozone layer is suffering an unprecedented The crisis and the repeated occurrence of catastrophic global climate change have seriously endangered the living environment and the health and safety of humankind. Even the rapidly growing or expanding GDP once prized by mankind has been greatly reduced due to environmental pollution and climate change (and therefore, Countries have called for "green GDP" development model and statistical methods).