1. By describing how much of an ocean garbage patch is invisible from above:
The author can explain that a significant portion of ocean garbage patches is composed of microplastics and other small debris that cannot be easily seen from the surface.
By this fact, the author can counter arguments from skeptics who claim that the absence of visible garbage patches proves their non-existence.
2. By sharing pictures from her own research and studies of ocean garbage patches:
The author can provide visual evidence of ocean garbage patches through photographs or images captured during her own research and studies.
it can help to substantiate her claims and make the existence of these patches more tangible and convincing to readers.