What are the population of grasslands. it can be animals or plants

Grasslands are one of the most widespread of all the major vegetation types of the world. This is so, however, only because human manipulation of the land has significantly altered the natural vegetation, creating artificial grasslands of cereal crops, pastures, and other areas that require some form of repetitious, unnatural disturbance such as cultivation, heavy grazing, burning, or mowing to persist. This discussion, however, concentrates on natural and nearly natural grasslands.
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The grasslands are made up of  65% animal and the rest are plant

We can use solar powered cars or ride bikes instead of cars that burn fossil fuels