The relationship between economy and environmental impacts has been an essential topic in the discussion on environmental problems for a long time.
President Trump's impact has been a little different.
McIlroy will not be part of that discussion but his impact has been a positive one.
The most notable, positive impact has been a reduction in casualties from airstrikes.
But the real impact has been a video that has garnered hundreds of thousands of hits on the web.
So far, he says, the biggest impact "has been a couple of lunch tables at the Triangle gas station".
But coming up with actual numbers — even a range like "tens of millions" — for the program's impact has been a complex endeavor.
For most Beijingers - and many Chinese outside the capital - the immediate impact has been a huge boost to their self-esteem.
"The stamp duty impact has been a much bigger factor in the profiles of activity over the year than the referendum".
Partnering with Lindsay Hadley, the owner of Hadley Impact, has been a huge step forward for us.
