Just a note on global warming.  There is a website showing where some of the temperature sensors are placed.  Although many of the sensors are well placed, there are a number of them that are next to air conditioner exhausts, parked cars, and blacktop.  If you have followed the debate on global warming, this is an interesting website.  There is also another website which shows the side of the debate you may not have heard.  It’s interesting.  I’m not sure the science is there yet to prove exactly what (if anything new) is happening or how much man is responsible for any climate change.