plants are a kind of resource & recycling resources / nonrenewable resources has a positive impact on the environment / conservation of those resources ->  recycling plants has a positive impact on the conservation of resources  if something has a positive impact on a process then that something helps that process & the conservation of resources is a kind of process ->  if something has a positive impact on the conservation of resources then that something helps conserve resources  recycling plants has a positive impact on the conservation of resources & if something has a positive impact on the conservation of resources then that something helps conserve resources ->  recycling plants helps conserve resources  recycling plants helps conserve resources & a compost pile is used for recycling plants ->  a compost pile helps conserve resources by recycling plants  a compost pile helps conserve resources by recycling plants & a bean plant is a kind of plant -> a compost pile helps conserve resources by recycling bean plants