Carbon is harmful to the earth, as known. And when it reaches water it’ll effect humans in many ways, it’ll usually make the water more acidic! And for us humans it’s harder to filter the water.
Interspecific competition can occur between two different species competing for the same resource in an ecosystem. So for this particular bug population, there may be another insect species that competes for the same food source or another resource, such as material or space for breeding habitat. This can lead to selective pressure, and may result in the different species evolving a more specific diet or inhabiting a niche environment.