[mkstowegnv]

>plants/bacteria need additional energy in the form of sugars to pull carbon out of CO2 in the air.

Sorry perhaps this is not what you meant to write. For anyone who wants an unmangled understanding of photosynthesis please consult Wikipedia or other text of your choice.

[opless]

Yes! I am pretty sure that I got confused ... either getting the Krebs Cycle the wrong way around or confused about where the ATP came from... Possibly the latter, this will teach me to comment about half remembering biology from over 25 years ago whilst still half asleep ..

However my original poorly explained thought stands there needs to be an extra component that will be consumed like ATP or H2O...