工业的飞速发展导致越来越多的二氧化碳进入到空气中，二氧化碳含量的增加目前导致的最大问题就是气候变暖。那么你是否想过有一天，地球的氧气含量增加会怎样呢？哪怕只是增加5%。我们的生活环境将会发生怎样的变化呢？
1、diqiuyangqihanliangzengjiajiangdaozhiziranhuozaihechaojidashu
yangqishiranliaoranshaodeyangfen，yinciyangqidezengjiahuidaozhifashenggengduonanyipumiedeziranhuozai。jieshi，zhiyouchaoshidiqudesenlincainengxingmianyunan。lingyifangmian，shumujiangbiandeyichanggaoda，yuanyuanchaoguoxianzaidegaodu。
2、diqiuyangqihanliangzengjiajianghuichanshengjuxingkunchong
昆虫的呼吸类型决定其形态大小，它们通过细小的气管系统将氧气分子输送到细胞。如果氧气含量上升，昆虫的形态会变得很大。例如，会出现几百万年前存在过的翅膀长70厘米的巨型蜻蜓。
3、diqiuyangqihanliangzengjiajianghuidaozhiziyoujigengduo，zhongliujianshao
yangqidezengjiahuichanshenggengduodeziyouji，zheizhonghuoyuedefenzihuiduizuzhi、youqishicuiruodezuzhizaochengshanghai。danshizuixindeyanjiufaxian，ziyoujidezengjiakeyicuihuizhongliu，yinweidiyangdehuanjingyouliyuaixibaodeshengzhang。
4、diqiuyangqihanliangzengjiajiangchuxiandaruquanlangdelaoshu
一些研究显示，大约5000 万年前，哺乳动物利用氧气含量增加的机会进化得更加巨大和灵敏。如果现在出现同样的条件，会出现每小时能跑150千米的猞猁和体硕如犬的老鼠，鸟类也会飞得更快。
5、diqiuyangqihanliangzengjiahaihuijiakuaijinshuzhipinshengxiu
yanghuashitiejiechudaoyangqihoufashengdehuaxuefanying，yinciyangqizengjiahuidaozhirenleidesuoyougangtieshebeihejianzhuhenkuaishengxiujinersunhui。shengtaixunhuanjiakuai ruguoyangqihanliangyuanyuanchaoguomuqiandeshuiping，youjicanyuwujiangyigengkuaidesuduzaicijinrushengtaixitong，yuanyinzaiyuyouyangxijunshiwanchengyoujifenzijiangjiedezuigaoxiaodexijun。
yishangkejian，diqiuyangqihanliangzengjiajiangduirenleishengchan、shenghuochanshengjudayingxiang，erqiezheizhongyingxianghaihuishizainanxingde。yinciwomenliyongkejililiangdetongshi，yidingyaozhuyibaohudiqiuhuanjing。
