Which of the following is not a manmade cause of global warming? 
 a. burning fossil fuels 
 b. deforestation 
 c. respiration 
 d. population growth user: which of the following practices that are needed to run a nuclear power plant has a negative impact on both air and water? 
 a. cooling of the power plant 
 b. mining of uranium 
 c. storage of radioactive waste 
 d. monitoring the reactor