I'm not a scientist, but neither was Leonard Nimoy.  But I don't have to believe scientists, Leonard Nimoy, or even PeeWee Herman if he had a view on the issue.  I can however look at things for myself and know something has changed.  I started going out in the woods with my dad when I was around 6 years old.  Grouse season in Minnesota starts in the middle of September followed by deer season the first or second weekend in November.  For anyone who is a grouse hunter, you know it's hard to get many shots at the critters when the leaves are still on the trees.  When I first started venturing out in those early days, the leaves were changing color on opening day and the trees were pretty much void of leaves by the first week in October.  That has gradually changed over the years to the point that 60 years later we still had a few leaves on trees for the opening of deer season this year.  I can also point that there are days in October that you can now hunt in short sleeve shirts because 70 degree days are not uncommon during the month.  When I was a teenager, if you tried going short sleeved, you would end up with hypothermia before the day was done.  I have to admit that I have yet to visit PA, but maybe someone slipped up and built a wall around it that was meant for the Mexican border, so you aren't seeing any changes there.  But I can report in for what I'm seeing in Norhtern Minnesota, and I don't think the changes are due to the use of alien lasers.