Actually I’m more interested in the decrease of a human’s fertility (man or woman). And I agree, killing sharks and rhinos, or generally the killing of endangered species for selfish reasons and alleged effects that aren’t even proven is despicable like nothing else!
Also, it doesn’t have to be pollen. Just thought that’s the most likely way that a plant’s presence could have an effect on humans.
I was just wondering because there definitely are plants whose simple presence has an effect on the human body. Just think of hayfever. Also I know of some plants who have a slight psychoactive effect when being near you for some time, like Ledum palustre.