*facepalm*
that graph proves nothing
and there are so many factors to do with our global climate you cant say what is havin what effect, for instance yes we are experiencing global warming (no im not sayin its man made, but its certainly contributed to by us) but at the same time our aircraft are creating a different type of cloud made up of minute particles that doesn't dissipate and fall as rain like normal clouds, they are also more shiny and therefore reflect more sunlight, cooling the planet.
also our climate goes up and down alot, every 3 million years or so due to shifts in our solar orbit our climate will go from cold to warm (creating what are ice ages....which is simply a period of time where there is solid ice on the planets surface) then whilst the climate is shifting up and down in these big waves, the are other waves every few thousand years where the planets axis of rotation changes slightly, again causing the climate to warm and cool
so with all those things going on, the climate is just too noisey to really discern whats happening