Is there any reason not to feed the dogs one and a half human portions of cooked vegetables a day in the hope this will reduce their cancer risk? (vetinfo.com)
Now, maybe this generation's goal will be to help negate at least the human portion of climate change.» (edutopia.org)
It is impossible to determine what portion of that change was due to CO2, let alone the human portion. (drtimball.com)