It’s important for controlling chronic conditions, treating temporary conditions and overall long term health and well being
Excretory as in excretes things..... anus, bladder, etcetera release waste products.
In cells, the vacuole disposes of waste.
Sweat glands secrete, well, sweat, which can also release toxins from the body.
That's about all I can think of at the moment...
Because cells are 2nd in order from simplest to most complex. Organelle,cells,tissues,organs,organ systems,organisms, populations, communities, and biosphere.
Answer
One way is that we have increased the amount of CO2 (carbon dioxide) in the atmosphere.