Not Leafing Anytime Soon

When I first started writing this blog, I shot out a quick blurb on the tree that refused to drop its leaves. Well, here it is 2 years and a week or so later. Still clinging to its leaves once more. The question is, is this due to global warming or other natural seasonal elements? Granted anyone that gardens or skis in the Michigan area knows damn well the averages are getting warmer. Note: the leaves around the tree were knocked off due to the tornado that ripped through the area a few weeks ago.