Obiously, Technology is improving exponetially...
A good hope for the future...
As for recycling...
It wastes more money to implement recycling systems than just to obtain more resources... As Seventh said, we are not going to "run out" of resources.
As for the Ozone Layer...
Bunch of balony... The leading cause of Carbon Floride Chlorines is Cow Methane, an obviously natural element... plus, The ozone regenerates itself pretty efficently. The only place I would be worried about Ozone Depletion would be New Zeland and parts of Australia, but I'm sure they'll get that under control...
As for cutting down Trees...
They Grow back...
As for Oil...
Petrolium might serve as a problem in the near future, as the price of it is pretty serious right now... Not sure whats going to happen here, but there is much effort in finding a solution in effect right now.
As for GarglyWargly...
I'd put my money on Fusion
As for me...
I hope I live long enough to see some of these problems unravel, whether it be good or bad.
Curiosity can be a dangerous addity.