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Humans affect plant life negatively by hunting, deforestation and also when humans kill each other (a.k.a when we do that the person does not do Respiration because they are dead.) And why we should stop doing this because when less plants are on the Earth how will we breath if there aren't enough of them and tons of us.
We have helped plant life because we do Respiration which is a necessity to plant life (Which is the oppisote with humans except for the fact that it is a neccessity to human life.) We should start to help them more in ways like planting more plants so that humans can have enough and so will plants if we do that