Humans do not eat the algae directly from the ocean, so how can we still be
affected by it?

it could affect the environment.

Explanation:

The sea life we eat could be affected which affects us humans.

emerging idea only occurs as a raw idea that could appear out of nowhere. meanwhile, to reach scientific consensus , that idea must be structured and tested over and over again through various experiments. the scientific consensus transforms the raw idea into idea that is more reliable through the process of scientific elimination.