Define the Demographic Transition and describe te four phases

In your own words, define the Demographic Transition and describe te four phases. Is the population stable, growing, or declining in each of the four phases? According to demographers, what factors led to a decline in the CDR and a decline in the CBR?

Not all countries have moved through all four phases of the Demographic Transition. Briefly describe living conditions and environmental impacts in developed countries that have reached Phase IV in contrast to these conditions or impacts in developing countries that remain in earlier phases.

Finally, if Phase IV of the Demographic Transition is a goal for developing countries, what programs or initiatives might assist in progress toward this goal?