answer:At the time, asbestos was still widely used in construction and manufacturing despite growing evidence of its harmful effects. Although regulations had been introduced to control its use, they were not as strict or widely enforced as they are today. Asbestos was commonly used in insulation, roofing, and other building materials, as well as in automotive and machinery parts. However, the dangers of asbestos exposure were becoming more widely acknowledged, and efforts were being made to minimize its use and to protect workers who were still exposed to it.

answer:Asbestos was widely used in various industries during the 1970s, with the construction and shipbuilding industries being the biggest users. However, awareness about the health hazards of asbestos exposure had already started to grow and there were regulations in place to limit its use. The United States Environmental Protection Agency (EPA) had established the Clean Air Act in 1970 to regulate emissions of hazardous pollutants, including asbestos. In 1975, the EPA issued the Asbestos School Hazard Abatement Act, which required schools to inspect for asbestos and remove it if necessary. The Occupational Safety and Health Administration (OSHA) also issued standards for the protection of workers who were exposed to asbestos in their workplaces. Additionally, a number of lawsuits against asbestos manufacturers and suppliers were filed by victims who had developed asbestos-related diseases, leading to tighter regulations and restrictions on asbestos use.

answer:垃圾分类是指将生活垃圾按照固定的分类标准分类，通常包括可回收物、有害垃圾、厨余垃圾和其它垃圾四类。垃圾分类的目的是促进资源回收利用，减少垃圾对环境的污染和破坏，提高社会公众的环保意识和生态素养。在垃圾分类的实践中，需要加强宣传教育和引导，建立垃圾分类的立法和规范管理体系，提高垃圾分类的监督与评估机制，加强科学研究和技术支撑。

answer:垃圾分类在不同的国家和地区具体实行的时间不同。例如在欧洲国家早在20世纪80年代就开始推行，而在亚洲的国家则相对较晚，如日本在1990年代初开始全国推行垃圾分类。在中国，垃圾分类是近年发展非常迅速的一个环保领域，最早的试点地区是上海市，其实施大规模的垃圾分类是在2019年起开始的，目前已经覆盖越来越多的城市。