Study after study shows that school librarians have a positive qualitative and quantifiable impact on student achievement. (livingindialogue.com)
At best, the models we have now could be thought of as representing the reasonably quantifiable impacts of CO2 emissions, hopefully on the back of a well calibrated climate model, and a guess at how climate change will affect economic and social well being. (niskanencenter.org)
Of course the impact of paper goes well beyond greenhouse gas emissions, with potential quantifiable impacts including habitat loss, air and water pollution, and waste management. (treehugger.com)