Because the people was short of relevant education and propagandiation, result in people didn't realize the essentiality of the problem, so would disregard the harm from environmental pollution in view of their own interests.
Due to lack of education and propaganda, people didn't realize the importance of the issue. They usually think on behalf of themselves,regardless of the irreparable hazards of the environmental pollution.
Due to lack of education and publicity, people didn't realize the importance of this issue. They usually think on behalf of themselves,regardless of harm for environment.
