Yes when fossil fuels are burned they release the carbon dioxide locked inside of them
that is why fossil fuels are a big source of global warming and we will eventually run out of fossil fuels
Believe it or not but there are nurses better then doctors but i say there is a 10% chance more will die
Spread of disease is density dependent because it is more severe the greater the population density as the disease would spread more easily. If there is low population density it would spread slower.