七年级生物下册4.7.1《分析人类活动对生态环境的影响》预习课件(新版)新人教版.ppt

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第一节 分析人类活动对生态环境的影响,同样是生物,人类对生物圈的影响远远超过了其他生物;同样是人类,现代人类对生物圈的影响远远超过了古代人类。,人类活动对生态环境产生了怎样的影响?怎样才能实现人与自热的和谐相处?,本节预习内容,探讨人口增长及其对环境的影响,分析表中内容:我国人口增长趋势是怎样的呢?,为了保护生物圈,为了人类的可持续发展,人类必须控制人口数量的增长,关注人类活动对环境的影响。,为了控制人口数量和提高人口素质,我国早已把计划生育列为一项基本国策,鼓励晚婚、晚育、少生、优生。,分析人类活动影响生态环境的事例,滥砍乱伐,残害鸟类,过度放牧,捕杀大象,沙尘暴,虫害泛滥,洪水泛滥,耕地沙化,面对这些问题,我们是无能为力还是有所作为?作为一个负责任的公民,应该对自己提出怎样的要求呢?,

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