- If something is required to create something else then that something is needed to make that something else
- Creating paper requires cutting down trees
- So, cut trees are needed to make paper

- Cut trees are needed to make paper
- Trees are a kind of resource
- Hence, 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
- Recycling reduces the resources needed to make something
- So, 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 means a reduced amount
- So, 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 negative has a positive impact on a thing
- Hence, 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
- Therefore, cutting fewer trees has a positive impact on the environment

- Recycling paper causes fewer trees to be cut
- Cutting fewer trees has a positive impact on the environment
- So, 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 impact is a kind of effect
- So, a positive effect of recycling paper is that it causes fewer trees to be cut

So, a positive effect of recycling paper is that it causes fewer trees to be cut
Question
Some schools have programs to recycle paper products such as student papers, newspapers, and cardboard boxes. Which of these statements describes a positive effect of recycling paper products?

Context
- If something is required to create something else then that something is needed to make that something else 
- Fewer means a decreased amount 
- Creating paper requires cutting down trees 
- Recycling reduces the resources needed to make something 
- Cutting down trees has a negative impact on an ecosystem / organisms living in an ecosystem 
- Decreasing something negative has a positive impact on a thing 
- Trees are a kind of resource 
- Fewer means a reduced amount 
- An impact is a kind of effect