Looking on the internet deeply has found these results:

I am concerned for humanity is the most popular phrase on the web.

I am concerned about humanity 14,770 results on the web	I am concerned for humanity 133,100 results on the web More popular!
Some examples and use cases from the internet:	Some examples and use cases from the internet:
It doesn't look like this phrase is very popular! The search could not find any examples on the internet.	I am concerned for her, Riddick, that she'll become... I am concerned for your safety. I'm just... I am concerned for the prisoner's mental state. I am concerned for the away team, but if we are to discover the fate of the two crewmen, I see no alternative. She's in my care and I am concerned for her, and as the facts bear out, with good reason. I am concerned for instance about the conflicting messages coming out of the US Administration regarding Russia. I want everyone in here to know that when it comes to my girls, above anything, I am concerned for your safety.

I am concerned about humanity

14,770 results on the web

I am concerned for humanity

133,100 results on the web

More popular!

It doesn't look like this phrase is very popular! The search could not find any examples on the internet.

I am concerned for her, Riddick, that she'll become...
I am concerned for your safety.
I'm just... I am concerned for the prisoner's mental state.
I am concerned for the away team, but if we are to discover the fate of the two crewmen, I see no alternative.
She's in my care and I am concerned for her, and as the facts bear out, with good reason.
I am concerned for instance about the conflicting messages coming out of the US Administration regarding Russia.
I want everyone in here to know that when it comes to my girls, above anything, I am concerned for your safety.