a year of oil via the oil drum
I can't help but swipe and reprint this image from The Oil Drum because as is often noted, a picture is worth one thousand barrels of oil. Note the Eiffel Tower for scale.
Another way to conceptualize this picture is that in last ten years, 10 of those dirigables have been released into the atmosphere, whereby they may float about and melt glaciers, stir up the tundra and bubble into the oceans.
Terraforming. What is good for the Venus is good for the Earth.