death rate - is the number of death's compared to the total number of people in a population at a given time., The death rate has gone down because - better health, more food and cleaner water, Birthrate - number of babies born compared to the total number of people in a population at a given time, Doubling time - number of years it takes population to double in size based on its current rate, How can growing population cause problems - water becomes polluted, and diseases spread quickly, and environmental problems, Ways to help clean the environment - use energy resources that do not cause pollution like solar, wind and geothermal resources,

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