Supposedly the sun is getting larger. If that is true, it stands to reason that it would get hotter here on earth and across the solar system. On the positive side, a warmer climate gives convertible owners more top-down days.
We may also be in the process of the poles swapping polarity (is that redundant?). It happens every 400K yrs and we are late. One of the side effects during the gradual switch is a loss of ozone. Maybe humans aren't the cause of this either.
As you can tell, I spend too much time watching the History Channel.