The results are presented in energy per mile, but nowhere do they discuss global impacts, damage to human health, resources, contribution to global warming, eutrophication or other
accepted impact categories recognized within the LCA field.
The researchers break down skeptics into three
categories: Those who completely deny the planet is warming (trend skeptics); those who
accept that the planet is warming, but question if it's caused by humans (attribution skeptics); and those who falsely claim that increasing CO2 emissions and a warming planet will be a good thing (
impact skeptics).