pollution; pollution began to exist on our earth, when human species completely gained their fully developed smartest brain.
1. If we start from air pollution, it was said that now nearly 90% of human populations were tend to breath polluted air. sometimes leaves tend to loose their chlorophyll due too sulpher dioxide presented on polluted air. even marine animals faces a critical situation such as ocean acidification . and also air pollution continuously damaging ozone layer. And usually we humans are the main cause of all of these disaster
2.not only air pollution but humans also generate water pollution, land pollution , thermal pollution, light pollution, radioactive pollution and the list goes on .
so, if literally we human species didn't stepped on the earth, other animals may have chance to see a pollution less world
humans lead other animals to the tomb; Extinction of other animals ; humans destroyed millions of species for flesh and many other purposes ,for example ,tsamanian tiger, pyrenean ibex, aurochos , great auk and mammoth were went extinct by hunting. dodo and stellar sea cow, were killed for flesh . pinta tortoise went extinct due to goats which were introduced to pinta island by humans and rats which destroyed the young ones of pinta tortoise
humans also saved some species; on a particular time when humans stops migrating , and started to live on permanent settlement, there they've started to save animals from being extinct , yes! i am talking about farm animal, if we consider a chicken which lives on forest, it can be easily hunted by animals and yes! humans too. and there is probability of that animal being extinct in many ways, but when these forest chicken turned into farm chicken they were breed by humans for they're use and killed so. even that was small life time for farm chicken compared to a forest chicken which lives 20 to 25 years they're one of the species saved by humans from being extinct.
so if humans didn't exist, some species have gone extinct but many species have been saved
no humans, no history; on case of not emergence of human species on earth's history, when we imagine that an alien is reading earth's history book, it won't find anything else like, " this king invaded this land and that king revenged that king ....... '' like you used to read on you're history book
humans and asteroid ;
humans are now so knowledgeable. so, that they'll be capable of saving the earth in future, such as saving earth from asteroid attack. but if humans didn't exist. this heroic event can't takes place on earth's history
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