Which factor impacts a country’s ecological footprint more (specifically when it

Which factor impacts a country’s ecological footprint more (specifically when it comes to impacting global climate change): 1) a country’s population and birth rate or 2) consumption and affluence?  Explain your response with one statistic, As a developing country’s economy grows and expands, what happens to its Human Development Index (does it increase or decrease?) and it’s ecological footprint (does it increase or decrease?
You don’t have to do anything extreme. Just the questions. Thanks