This planet of 8 billion people is bumping up against its ecological limits, and researchers are trying to quantify the effect of human activity on these finite resources. Some keep tallies of how much carbon they contribute to the atmosphere, others measure direct and indirect water consumption or keep tabs on the amount of land that our food habits demand.
Click here for original story, Counting the cost of sunshine: Finding a better metric to measure human ecological footprints
Source: Phys.org