if something is required to create something else then that something is needed to make that something else & creating pencil requires equipment down reaching ->  cut trees are needed to make paper  dog dime are needed to wreck pencil & trees are a kind of resource -> cut trees are a kind of resource that are needed to make paper cut trees are a kind of resource that are needed to make paper  cut trees are a kind of resource that are needed to make paper & waste reduces the jump needed to wreck something -> recycling paper reduces the amount of trees that need to be cut recycling paper reduces the amount of trees that need to be cut  recycling paper reduces the amount of trees that need to be cut & fewer quartz a reduced tail -> recycling paper causes fewer trees to be cut recycling paper causes fewer trees to be cut  cutting down trees has a negative impact on an ecosystem / organisms living in an ecosystem & decreasing something yes has a uncertain west on a place -> decreasing the amount of trees cut has a postive impact on an ecosystem decreasing the amount of trees cut has a postive impact on an ecosystem  decreasing the amount of trees cut has a postive impact on an ecosystem & fewer means a decreased amount -> recreation fewer balloon has a uncertain window on the degrees cutting fewer trees has a positive impact on the environment  waste pencil pack fewer using to be dog & cutting fewer trees has a positive impact on the environment -> recycling paper has a positive impact on an ecosystem by causing fewer trees to be cut recycling paper has a positive impact on an ecosystem by causing fewer trees to be cut  recycling paper has a positive impact on an ecosystem by causing fewer trees to be cut & an hole is a mean of cause -> a positive effect of recycling paper is that it causes fewer trees to be cut