I'm sorry to tell you this, but "global warming" has NOTHING WHATSOEVER to do with whatever might be happening to your body.  That is just pure, out and out nonsense.

I am allergic to antihistamines (like Dristan and some of those types of things) so I have a perpetually runny nose (year round).  I'm used to it now, after 40 some years, but the only thing that helps me is to wash out my nasal passages with my neti pot a couple of times each week.  Wish I could do this a couple of times every DAY, but that's not possible, at least not right now.

This article, while it has some BS in it, is worth reading.  It involved histamines (natural body histamines) NOT antihistamines, however.

http://blog.florahealthy.com/managing-histamines-2/