So i understand that this is a sensitive subject, and i didnt mean to pull any heart strings. I too desire a more harmonious food industry, but i'll draw the line where logical fallacies are cornered. The biggest trap that passionate people often can fall into are confirmation biases. I just like to present a rounded argument treating all perspectives fairly, so i feel its only fair that i reply.

….most people on planet are consuming factory animal farm meat) but what about the health implications of eating meat, does that not bother you?
Yes, when we dont care and show respect for our food stuffs, not matter what it is, it's not healthy.

no where near the same level of atmostpheric polutants are produced by animal farming
YES they are creating atmospheric and all kinds of other pollutants
Key word there is LEVEL. Im not suggesting that animal agriculture does not produce waste, its just not to the same level or degree as other sources of pollutants.

A staggering 51 percent or more of global greenhouse-gas emissions are caused by animal agriculture… climate change…
Again the assumption is that greenhouse gas emissions, specifically anthropogenically (by humans) are CAUSING the climate to change. Ill redirect you to research; solar minimum, solar cycles and moon cycles and their effects on the global weather. This is a natural process.
Try SuspiciousObservers Youtube channel for more information on this subject.

It takes an enormous amount of water to grow crops for animals to eat, clean filthy factory farms, and give animals water to drink. A single cow used for milk can drink up to 50 gallons of water per day—or twice that amount in hot weather—and it takes 683 gallons of water to produce just 1 gallon of milk. It takes more than 2,400 gallons of water to produce 1 pound of beef, while producing 1 pound of tofu only requires 244 gallons of water. By going vegan, one person can save approximately 219,000 gallons of water a year.
All of these statistics come from INTENSIVE MONOCULTURE, which by design is extremely inefficient. Grass fed free range cattle sustainably managed will not require anywhere near the levels of input. The logic of this specific statistic is concerning to me. I can bet that MONOCULTURE soy or corn is produced and then fed to the cattle, this fact counts to their water intake, they are also requiring extra drinking water to wash down the died legumes and grains..
Here is some information on Integrating Livestock in the Food Forest

Runoff…
If there is runoff, then there are too many animals per square foot/metre, or there are no sustainable technologies in place in order to make use of the runoff resource. Eg methane generators and biodigesters..

Using land to grow crops for animals is vastly inefficient…
I answered this point in the replies above, but ill expand here for further clarity. With appropriate design, multiple systems can be layered together, making a polyculture instead of monoculture. Again i can guarantee that the majority if not all of the stats used have been taken from monoculture systems, which are as you can see are very inefficient.

In summary:
I was a vegetarian for a few years, whilst doing a lot of research on all of the above subjects. I am just as passionately inspired to making a positive change when it comes to production and consumption, of which we are all learning what that looks like and how to achieve it globally.
Here is a quick link to how different design and management techniques can be regenerative and therefore sustainable.
Check out Permaculture Principles: Energy Efficiency
Ill be writing some blogs on subjects like these in the future and would appreciate your opinions, be sure to follow me and comment. :D