Case in point, The eruption of Mount Pinatubo in the Philippines in 1991. The amount of crap it spit into the atmosphere reduced the global temp by like 3* for 3 or 4 years.
If you just looked at that time frame, it looks like the earth is cooling down, not warming up, but if you look at the larger time frame you can see it was just a small decline in the general incline of the global temps.
So looking at just the past 10 years doesnt do anything. You need to look at the big picture.