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Coal mining has caused serious air pollution and severely damaged the groundwater system, resulting in a mined-out area of 5,000 square kilometers.
Compared to the two other major Chinese airlines, China Eastern has a comparatively small fleet of B737 aircraft, according to Yu.
Companies should be encouraged to set up more biofuel pilot projects. The government could also consider promoting bioethanol and come up with compulsory biodiesel usage policies or subsidies for companies to further enhance the usage, he said.
Collignon favored the efforts made by scientists in many countries to develop a vaccine against COVID-19, but regretted that they have not been successful.
来源：资阳报