It is not news that people are concerned with the pollution of air and water, desertification and resource exhaustion. People realized that the growth of population, the acceleration of economic activities and the wide spread pollution, human beings are making stronger impacts on the environment. New evidence of global climate change, changes in the ozone and the decrease of biodiversity has increased people's anxiety. Besides, highly exposed environmental disasters have urged the public to believe that the effect of company activities on the environment might violate the operation permits of business stakeholders.
Question: New scientific evidence has only proven known fact.
Options:
A. true
B. false
C. uncertain
Answer: C