The sub-region of Africa that is home to the Kalahari Desert is the south. The desert is approximately 900,000 square kilometers. It covers parts of Botswana, Namibia, and South Africa. The correct answer is C.
The main sources are humans which is why it is stated that the global warming is man made. The levels have increased beyond all measure, increasing since the 1950s by a 100 CO2 parts per million, and it keeps increasing by 2ppm on a yearly basis. The statistics from the industrial revolution era are not much different and show how much we've increased the CO2 in modern times.
Qualitative meaning -C is the symbol of atom of element carbon. ... This means symbol stand for a specific element.
Secondary source as it is not direct :)
