The aforementioned aerosol injection seems to be a very innovative, economical and effective way to slow down the global warming, but why hasn't it been implemented yet? As mentioned earlier, there are concerns that unpredictable accidents or dangerous side effects may occur, and numerical models that evaluate the effectiveness of climate engineering technologies have yet to be fully implemented. This is also because various problems are raised in the impact on the global environment and ethical aspects of geoengineering.
1. If climate engineering is stopped before the concentration of greenhouse gases in the atmosphere is sufficiently reduced, the temperature will rise rapidly at that point. This is called a terminal problem.
2. The sky loses its blue color and turns foggy because of increased scattering light.
3. Because direct sunlight is reduced, the power of facilities that collect sunlight (collective solar cells and solar power generation) is reduced.
4. Increased turbidity in the stratosphere may interfere with the operation of aircraft flying in the stratosphere.
5. Aerosols sprayed in the stratosphere promote acidification in the atmosphere, which can lead to acidification in the oceans and damages biodiversity. Marine acidification reduces the population of phytoplankton, reducing the ocean's ability to absorb carbon dioxide. In particular, sulfates and nitrates, which were concluded to be the most effective aerosols, are components that greatly affect the acidification of atmosphere and oceans. Thus, caution should be exercised when using them.
6. Aerosols in the stratosphere can decrease solar radiation, reduce the amount of water vapor in the atmosphere, and finally result in diminished precipitation. For example, there is a disturbance in Asia's monsoon climate which has a lot of rain in summer and dry weather in winter. Korea also belongs to a part of the monsoon climate. Geotechnology can cause drought and water shortages in these monsoon regions. In addition, even if solar radiation or temperature changes occur locally only in certain areas, the Earth's water circulation system may change entirely, resulting in an imbalance in precipitation.
7. The geotechnical maneuver tends to view the problem of global warming only as a linear causal relationship. Emphasizing that the Earth is a large self-regulating system, a nonlinear system and an irreversible system, the way to view nature as a machine by fragmentary approach is criticized. Non-consequentialism points out that ethics about environmental problems caused by an individual's accumulation of unintended and trivial behaviors for a long time. Without various discussions in terms of environmental philosophy and ethics, it will be difficult to maintain a sustainable environment as well as to relieve global environmental inequality.