Assume that the biocapacity of earth does not change and that human population growth continues to increase. how will people's ecological footprints need to change in order to most effectively sustain our population?

The correct answer is option A.

Explanation:

Ecological foot print: The impact of the person or the community on the environment which is expressed in the terms of land required to sustain, use of natural resources done by them.

The ecological foot prints increases with an increase in the population of the group or nation.This is because with increase in population ,demand of basic necessities will increase which will further  increase use of all kind resources.The consecutive use of resources will decrease the amount resource or will lead to exhaustion of resource.

if the population of earth increases it will increase the average ecological foot print due to which sustaining on the Earth will become difficult and inefficient.

So in order to deal with this the average ecological footprint will required to decrease.Hence correct answer is option A.

yes the answer is total mass in unchanged   : )