I never cut all the trees from my cities. I only would in a very rare occasion that there's only 1 or 2 tree tiles and I simply just have to use those areas. They are just too beneficial in late game for that health bonus, IMO. Plus, I simply can't stand barren territory.
I am American and Conservative too

But you'll never catch me littering, dumping oil from a car into a sewer or cutting down a tree without an absolute need. I HATE when people cut trees for no reason. ... I'd love nothing more that to just surround my house with trees.
So regardless of what everyone else does, nature is *everyone's* job to keep up. I'm doing my part and I'm not an 'eco-nut'.
Good for you! I think it's just part of taking care of our home, in our own best interest. To me, "Conservative" is about conserving what's good, and most emphatically NOT chopping it down for so-called "development"...
I grew up on a farm, with some forest round the edges, so that's home to me; and it wasn't just my imagination that the air was fresher there.
Do they still teach children that we get our oxygen (absolutely essential to human life) from trees, which take in the carbon dioxide we breathe out, in a symbiotic cycle that's been going on a few million years, and continues to keep us alive? When I read posts like #10 of this thread, I begin to wonder.
One thread here was persuading us to chop everything and spam cottages, but I'm glad I saved some forests for Lumbermills.
Here's a completely Unscientific survey, simply taken from this short, 3-page thread:
As you can see, again and again, we're clearly in favor of planting trees:

And plant a forest should definetly be an option. - ZB2

I do believe you should (at some proportionate expense) be allowed to plant trees. - Crighton

Certainly it can be exploited if it is allowed too early. However, I don't see why it can't be implemented in the late game, at least after the discovery of Biology. This fits the reality as people didn't fully realize the benefits of forestation till quite late. - gettingfat

I believe that trees should be replantable, perhaps with a certain late-game tech. (say: forestry - requires economics and replaceable parts). After all - forests ARE regenerating resource - at least temperate forest. - Yeekim

...but i like the idea of tree planting... - kristopherb

I think reforesting should be enabled. But only quite late in the game, in the period where people started to think about that forests are needed for earths survival and stuff like that. There will hardly be any exploits about it that late in the game, because by then you will have such a big industry, you don't need the chopping as much as you need the health benefits. - Tavenier

I rarely chop forests, mainly because I can't plant them again. I personally think forests and jungles should be made more productive, tree planting should be allowed and Environmentalism moved to Scientific Method. - taillesskangaru

I wouldn't mind seeing a few more options like planting trees. - Reprisal

Workers can plant forests, but: (list of restrictions follows) - Donny
Having been in the Civ3:Conquests public beta test, I've seen the kind of pressure the charge of "EXPLOIT!" puts on the game designers. So they simply removed our ability to plant forest. End of problem for them; beginning of problem for us.
To be fair, they put in a slight mechanism for automatic forest regrowth, but it's not nearly enough. And why can we build farms, plantations, pastures, etc wherever and whenever we want, but not forest (which happens to grow itself back, unlike all these others!) It makes no sense, which convinces me it's political ("an EXPLOIT!") rather than sensible.
[Thanks all, for letting me quote you.]