Lookere Chester, I can assure you I've forgotten more about the Great Smoky Mountains than you'll ever aspire to know. I know all about its current plight with auto emissions and the effect they are having on trees above a certain elevation. I know all about the parasitic infestation that is killing every pine tree in sight. I am fully aware that the American Chestnut has been genetically resurrected and seems to be adapting every bit as well as the original, which disappeared generations ago. I know these things because I regularly contribute monies to an organization that tends to the conservation needs of the park far beyond what the warshinton gubmint does. I also live here. These mountains across the road BECOME the Great Smoky Mountains a few miles from here. I was born here, I live here, and with the grace of a loving God I'll die here. I walk among the mountains every chance I get, and while there I (hold your breath, novel idea coming) LOOK AROUND AND OBSERVE WHAT I SEE! Now calm down...I am all aware that in no way does that even come close to equalling your googling prowess. But I'm right content with it.
I still remember my fourth grade science classes too. That was afore the interweb too. I seem to recollect a lil thang called photosynthesis, and how that was right good overall fer people to have oxygen an such. I won't insult your intelligence...you can google photosynthesis and read 482 pages about it sometime and eventually see whar trees do that.
Or.
You could let go of your coworkers one day and take your happy ass to a forest and breathe. It's possible you might determine that the air smells a might cleaner there. Or not.