I’m leanings towards A but it may also be B.
<span>The main difference between a community and an ecosystem is that the ecosystem is defined as the result of what happens when a community of living organisms shares and interacts within their environment. What this means is that the ecosystem is a product of a specific community. There are several types of ecosystems, for example, a marine ecosystem, the rain forest ecosystem, the swamp ecosystem, and the desert ecosystem, just to name a few.
Hope this helped. :)</span>
It will increase the amount of ground level ozone in many regions, and result in impacts of air quality.
This will cause problems for ozone standards in the future.
Hope this helps!