Here is how the EPA defines the distinction, sort of a matter of semantics really:
“The phrase 'climate change' is growing in preferred use to 'global warming' because it helps convey that there are changes in addition to rising temperatures.” **broken link removed**
Anyhow, In the earlier part of Earth's life, you used the dinosaur era, so let's say the cretaceous period, there was a lot more volcanic activity, which vented Carbon dioxide, sulfer dioxide, nitrogen, and other gasses. This atmospheric layer insulated our planet and trapped heat. It keeps heat in and keeps heat out -- some but not all obviously. This is still happening, via Co2 emissions. And the ozone layer does get punished because the gasses 'punch' through this layer to keep on rising. Our atmosphere is made up of the Troposphere, (the lowest level, it rises about 10 miles up and gets cooler as you get higher, this is where clouds are) the Stratosphere, (no more clouds except the cirro-types and the temp increases a bit, it goes up til about 30 miles and of course the ozone layer is here. Remember that ozone is just another gas, a form of oxygen) the Mesosphere, (about 50 miles up and temps go down fast as you go higher) the "prized" Ionosphere, (which is part of the thermosphere, and it starts off at 50 miles up, it is encompasses plasma and this is where we see such beautiful displays of aurora's. It goes on for hundreds of miles, with the temp increasing with altitude, and this is the level that the govt. installation H.A.A.R.P. uses to bounce microwaves off to a satellite to transmit energy -- Tesla's idea, stolen as usual) and also in the thermosphere is the Exosphere, (the last boundry before outer-space, it goes to about 800 miles and then space.) Just thought I would explain that for anyone who cares or did not already know.