No matter what the threat itself might be, the cause will be humans themselves.
We are our own worst enemy.
We are raping and polluting the planet faster than we ever have. We are threatening our own survival by our farming and fishing policies and we won't, can't and don't want to stop.
We are our own biggest threat.
Humans
Yes
Humans and human activity are the biggest threat to humans.
Humans are the biggest threat to wolves.
Humans and human activities, particularly fishing are the biggest threats.
loss of habitat
Humans, we are the largest and biggest threat to the Florida Panthers.
it comes from chicken, okay?
Homo Sapiens, or humans.
I would have to say that humans are the biggest threat to wolves. Wolves were hunted because many scientists believed they were killing all of the deer and caribou and livestock.
Bengal tigers have no natural predators. Their biggest threat is humans.
The biggest threat to mandrills is humans who hunt them for bushmeat. Loss of habitat through deforestation is another threat.