They convert carbon into other 'waste' products like oxygen. To put it simply it removes carbon from the carbon cycle.
The organelle described above is called the endoplasmic reticulum.
The rough portion of this called the granulated endoplasmic reticulum and the ribosomes attached to it enable it to produce proteins.
The smooth portion of this organelle does not contain ribosomes and it has a role in the synthesis of lipids.
The total amount of oxygen in the ecosystem,light available, and sugar molecules would decrease.