I didn't actual say when I was born mikos ,
Yes I knew all that last year ....they do say once one reaches a certain age there is a tendency to repeat things 

I don't eat big Mac's lol. I have had The odd kebab up green lanes or was it wood green? , no perhaps Southgate if that's any help
Unless you were born in the US and spent some years living there I'm afraid the idea you have met more Americans than I is simply also incorrect 
Bit like that fact free USS Forrestal story lol

I was invited to Cyprus s few years ago but apparently it was full  of Russians washing their roubles 
Still i might venture a trip to some third world place like Preston soon 

Really the need to import doctors and nurses should be self explanatory . 
Basic medical training is ,5/6 years another two as junior doctors , 8 years, then if you need a consultant add another ten
You can hardly fill that void overnight, a similar situation with nursing although the training period is less
The BMA is one of the most effective trade unions around and arguably the number of medical school places hasn't kept up with demand 
The younger generation have a much higher burden than baby boomers did paying for the retired in their day
Proportionally there are far more old people for the young to support so increasing immigration in this group would help lesson that burden 

Ah yes the Tweety birds lol
Wealth as economically defined is partly a function of items validated in the market place 
Tweety birds do not generally have a value in the market place though you could put a notional value on those, similarly space, sunlight etc but this would generally be considered extreme loony left by most, but not it seems by all, who prefer to see themselves on the right lol
Abbot btw did attend Oxford not quite on par with spam:distribution 
You could and others have made the Tweety bird case, but it's hardly orthodox conservatism and would need a pricing policy 
I doubt it would gain much support realistically when it's crunch time regardless of how many nature programmes are on
People want their TR 6 , even if they don't get them, their gizmos and ,72inch telly especially in Blackburn I seem to recall

The resources question might present some short term issues but it's no different from general population growth of which there are no restrictions so by Malthusian way of thinking we should have grown into disaster way before now
Yes certain physical space is finite but since most of us live with that limitation already it's not of huge concern 
We may find the oceans take back some of our space way before we outgrow it by population expansion if at all