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I shouldn't have skimmed over the article the first time. I missed these gems:
If the earth was one degree more off its axis, we would have no seasons.

The earth's axial tilt varies between three degress year-round. While a large change in the earth's tilt would have catastrophic effect, the change required is significantly more than "one degree".

. If there were no Himalayan mountains, there could be no agriculture.

Unfortunately I can't find anything regarding this claim (as in, I can't find anything to refute or to substantiate it).

If we were just a bit more close to the sun, life would be untenable.

What is meant by "a bit"? The earth's distance from the sun fluctuates significantly (about two million miles) during its orbit (hint: the earth's orbit is an ellipse, not a circle). Further, the "life zone" for life on an earth-like planet is actually within the range of Venus and Mars -- true, you would limit the kinds of life possible at the extreme edges, but life would still be possible (it only does not exist on the other two planets because of their hostile atmosphere).

If there was a bit more nitrogen in the air, say bye bye.

Unfortunately, I can't find any information (for or against) this claim either. I'm wondering if this and the Himalaya claims were actually presented by reputable scientists or just made up to "prove" a point because they sounded promising...

I saw something else in your response. Nitrogen gas exits in small amounts in the earths atmosphere. If it increases ever so slightly (When I say ever so slightly, to a scientist it would be huge, but for the laymen it would seem miniscule. 20% tp 22.5% seems small but is actually pretty impossible to do.

In regards to the sun comment, I should have been more clear. The axis upon which are on, is truly a miracle. If it were any different, there would be no life. I did not mean to suggest that if the sun was 9 miles closer life would be wiped out. I was not clear on that sentence (It was added late at night and was not properly revised). But my facts are not made up, again Fr. O'Malleys "Meeting the Living God." He discusses many of these things and would be the one to give you the actual sources.