What evidence proves we are speeding it up? How much? If you hit the ground at terminal velocity or terminal velocity - 1 fps DOES it really matter?
Well what evidence we have does seem to show that The increased C02 in our atmosphere is heating it up at a greater rate, and we can show that it is us that is pumping this extra C02 into the atmosphere.

When you look at those charts(the same ones I have referenced twice) that show those 5 ice ages, pay attention to the scale at the bottom. 450K years compared to the Earths age is a small time span.
450k Years compared to the time we have had civilisation on Earth is incredibly small whcih is what we should be measuring it by there has only been 1 Ice Age in the whole of Human History, and also you seem to be assuming we are on the verge of a new Ice Age where is your evidence for this ?

On Wikipedia (which is where your chart comes) it says - "Predicted changes in orbital forcing suggest that the next glacial period would begin at least 50,000 years from now"

You seem to be saying because we have Ice Ages which could happen in 50,000 years time then we shouldn't really care what we pump into the atmosphere now as it wont matter.