Humans are supposedly rational: in other words, they have a capacity for well-considered thinking and behavior.
Opposing Evidence
Humans are supposedly rational: in other words, they have a capacity for well-considered thinking and behavior.
Opposing Conclusion
Humans are superior to other animals.
Premise
But humans knowingly pollute the world’s precious air and water and, through bad farming practices, deplete the soil that feeds them.
Intermediate Conclusion (thus)
Humans are not rational.
Main Conclusion (so)
It is absurd to regard humans as superior to other animals.
Evaluate
That humans knowingly pollute the world’s precious air and water and deplete the soil that feeds them may show that in one respect humans are not rational. But other actions taken by humans may still be considered rational. So humans may be superior to other animals after all.