I still chop my forests for hammers, but i've never had a clear felling mentality, I"ve allway's saved a couple for health/lumbermills, 3 hammers, 2 food and 1 commerace(by river) POST railway's/replaceable parts..is hard to miss...
Early hammers, I've rather improve my resources, grow the city faster and wait longer to get out settler, and spam more in a shorter space of time..
National parks, I generally set this up in a tundra area, with many trees in its initial starting postition. By the time it his its late game, so you don't need to clear fell to get it up and running, you can wait. The 1 FREE specialist per FOREST PRESERVE is just BRILLIANT. No food used, so a medocare city with 5< food, suddenly just BOOM....Spread Sids Suchi, or Ceral mills there..and rapidily, you've got a core city in production/population. Of course you'll also need Mining Inc or the other hammer company.
If its on a river, with levy and Power...WOW!!!!, So why pass up these other wise "space filling cities"...they can become a late game CORE CITY.
Back on topic, you need Mathematics for 100% hammers from chops..or 50% more?, but I've never been a clear felling guy, I'm a moderate conservationist.
