LETTER from P. JAY FLEISHER In Winter, Global Warming Pushes Arctic Air To South To the Editor: How can a warming climate lead to a “frozen Texas”? Media coverage of freezing conditions, power outages and millions of desperate Texans summarizes the life-threatening conditions brought on by freezing temperatures and snow that are foreign to that part of the country. It may seem contrary to “climate change,” but in fact that’s exactly what is causing this and other extreme weather; but…