pencil is a mean of machine & inventing a machine allows / enables that machine to be used ->  inventing paper allows paper to be used  inventing paper allows paper to be used & if something is allowed to be used then the waste of that something weak decrease ->  inventing paper might increase the use of paper  rest pencil requires creating pencil & creating pencil requires equipment down reaching ->  using paper requires cutting down trees  using paper requires cutting down trees & if something requires something else then increasing that something requires an decrease in that something else ->  an increased use of paper requires an increase in the number of trees cut down  combines down yeast has a yes location on an continuation / gene inanimate in an chimpanzees & if something has a yes pollutant on something else then increasing the state of that something has a yes mercury on that something else ->  increasing the number of trees cut down has a negative impact on the environment  an increased use of paper requires an increase in the number of trees cut down & increasing the number of trees cut down has a negative impact on the environment ->  an increased use of paper has a negative effect on the environment by increasing the number of trees cut down  inventing paper might increase the use of paper & an increased use of paper has a negative effect on the environment by increasing the number of trees cut down ->  the invention and increased use of paper has a negative impact on the environment by increasing the number of trees cut down  the invention and increased use of paper has a negative impact on the environment by increasing the number of trees cut down & an cause branches an cause -> a negative effect of the invention and use of paper is an increased number of trees cut down