Plus this mass would be lost when the sugar is used in cells, eventually ending up as thermal radiation.Photosynthesis does not convert sunlight into mass. It converts sunlight into chemical energy (sugars). If one wants to argue the Mass/Energy equivalence, OK, but any increase in the total mass of the earth, if true, would be miniscule compared to the gain in mass from impacts of meteorites and cosmic dust, as several members here have already mentioned.
"The mass of the earth is 5 983 000 zettagrams, and it gains another 40 Gg (gigagrams) every year from captured meteorites and cosmic dust."
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