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The greenhouse gas consumed by plankton and removed from the surface ocean when the dying cells sink to depth makes way for the uptake of more CO2. In a way, the tiny organisms act as a biological conveyer belt for the transport of carbon dioxide out of the surface and into the deep ocean.
The carbon cycle is complex, but understanding how it works is important in order to understand why the climate is getting hotter. The Earth's atmosphere traps heat at the planet's surface. This is known as the greenhouse effect, a necessity for life on earth. However, when atmospheric concentrations of certain gases rise, they intensify the heat-trapping greenhouse effect. Carbon dioxide is a major greenhouse gas, and rising concentrations of CO2 are followed by rising heat levels.