From an environmental point of view, the development and utilization of fossil fuels is one of the main causes of atmospheric and other types of environmental pollution and ecological damage. How to develop and use energy at the same time, to protect the survival of the human environment and ecological environment has become a global important issue. Since the middle of the twentieth century, countries around the world have taken measures to improve energy efficiency and improve the energy structure to address this major environmental issues closely related to energy consumption, known as clean energy.
Global climate change is a major global environmental concern, and since the era of industrialization, human material civilization has been highly developed, at the same time, the earth’s ecological environment has been severely damaged and deteriorated. In the past 100 years, the global average temperature rose 0.3-0.6 ℃, the global sea level increased by an average of 10-25cm, which is the so-called “greenhouse effect”. According to research reports, about 80% of greenhouse gases are caused by human activities, of which about 60% of the role of CO2. Visible CO2 is the main greenhouse gas type in the atmosphere, and fossil fuel combustion is the main source of C02 emissions. In 1990, the world’s primary energy consumption accounted for 27.3%, 38.6% and 21.7% of coal, oil and natural gas respectively. These fossil fuels emitted a large amount of C02 into the atmosphere. It is expected that the global average temperature will rise by 0. 2 ° C every 10 years from the beginning of the 21st century if greenhouse gas emissions are not taken, and the global average temperature will rise by 13. 5 ° C by 2100.
Solar energy can be used directly, basically no pollutant emissions, clean and clean. At present, various types of power generation carbon emissions rate of 275, oil power generation 204, natural gas power generation 181, solar thermal power generation 92, solar photovoltaic power generation 55, wave power generation 41, ocean temperature power generation 36, power generation 35, wind power is 20, geothermal power generation 11, nuclear power generation 8, hydropower 6. These data are based on the raw materials used in various power generation and combustion of mining and transportation, the manufacture of power generation equipment, the construction of power grids, the operation of power supply and the maintenance and waste discharge and disposal of all the energy consumed in the cycle. A variety of power generation methods in the life of the power generation calculated. The carbon emission rates of the various power generation methods are shown in the figure.
Solar energy emissions are much lower than coal oil and natural gas.