Dude, you're dumb on so many counts...
First, you missed the point of his post, which was incorrect to start with. (Note, I'm not calling the guy who brought this up stupid, its a topic that got a lot of discussion in my ecology class, so its a valid assumption. This is what my prof set straight

Hotter temperatures wont increase agriculture. High temps will only deplete water reservoirs more, increase the need for irrigation (which is relatively inefficient and wasteful) and leech more nutrients from the soil. Areas that grow lots of shit now would be fucked, eg the Midwest, Northern China, Russia. Its not like tundra will suddenly become a mecca for farming either. Good farming soil takes centuries to develop, and you need a good solid organic layer first, which many arctic areas dont have. So no, we cant just re-adapt and shift everything north when it gets hot.
Ok, now that we've corrected that which you quoted. Onto your organic misconceptions. Organic farms arent worse for the environment, whoever told you that must have been snorting high-ligheters so far up their nose they touched brainstem. Yes, organic farms do cost more to run and operate. However, they're worse for the environment? What? Ok, let me break this down for you:
- Pesticide use: Bad for the environment, yes? Gets into lots of organisms, predators eat the critters that it effects, and it moves up the food chain. DDT anyone? Organic farms dont use it, while most of the apples and veggies out of the organic isle are covered with it. Also, the runoff from this is obscenely bad for the rivers and watersheds around farms. I hope you wash your dads pears...
- Fertilizers: While all fertilizers have potentially bad effects if they run into streams and such, at least natural ones break down easier and are better for the soil. Most other fertilizers just stimulate the soil, while poop builds the organic layer. Also, one of the large components of fertilizers is ammonia... 1% of the worlds power output is used to create the ammonia for this. Thats a fucking ton. You dont need to use the Haber Process with poop, so you tell me whats more environmentally friendly?
- Bacteia: Kid, stay out mircobio, because you dont have a fucking clue. Your toothbrush is covered in fecal cauliform bacteria. Everything in your bathroom is. You probably have over a billion of those little fuckers in your ass right now. Bacteria are all around us an in us. Getting large concentrations of them in places they shouldnt be is bad, yes. Thats why you dont want to eat raw steak. But chicken poop giving your pears bacteria... haha, even if someone smeared your fruit with poop right out of a roosters ass, you could still simply wash it off and safely eat it. Not so with industrial pesticides and fertilizers.
As for the smell, well, I guess you got me there. It cant all be roses, and if I have to endure the smell of shit when I drive back home across the valley, so be it. At least I can still fish in our streams.