Exact(1)
They concern about $10 trillion (USD) overall, which is quite a lot of money considering that total gross world production for 2014 was about $78 trillion.
Similar(7)
Were they concerned about freedom of speech?
So what were they concerned about?
Were they concerned about the feelings of their peers?
I mean, are they concerned about their carbon footprint?
Are they concerned about saving or buying a house?
Might they, concerned about how their behavior was viewed, not go to "the edge"?
But are they concerned about it?
Related(2)
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Since I tried Ludwig back in 2017, I have been constantly using it in both editing and translation. Ever since, I suggest it to my translators at ProSciEditing.

Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com