Why is that paragraph an effective conclusion to the editorial?

Primary productivity in an ecosystem is important because it lays the foundation of the food chains and food webs being observed in an ecosystem. It is the initial and main source through which energy is added into the food chains and food webs in an ecosystem. The organisms in which primary productivity occurs bring energy for the different organisms living in an ecosystem. Without them, energy will not be able to flow through an ecosystem as there will be no energy produced.