An ecological footprint A) is a means of determining increases in populations that lived in the past. B) is a means of understanding resource availability and usage. C) measures dispersion and adaptability. D) will estimate population movements.

An ecological footprint is a means of understanding resource availability and usage. The correct option is B.

Explanation:

The ecological footprint is a method which is used to measure the rate as which humans use natural resources in their environment and generate waste from them compared with how fast nature can absorb these wastes and generate the used resources again. The productive areas which are measured through this means are:

--> cropland,

--> grazing land,

--> fishing grounds,

--> built-up land,

--> forest area, and carbon demand on land.

The importance of ecological footprint to the environment should no the over emphasizes. When properly observed, different environmental pollution would be dealt with. Generally, there would be:

--> decreased desertification,

--> decreased global warming

--> availability of fresh unpolluted air and

--> decreased carbon emissions.