Mongabay
March 26, 2021
From the eye of a satellite, the ocean is streaked with smoky white lines that flow and twist like scribbled handwriting across the surface. But these lines aren’t naturally occurring features — they’re sediment plumes from large trawling vessels that scrape the seafloor with nets and heavy equipment, trying to catch bottom-dwelling species like shrimp and whiting.
The environmental consequences of trawling are still being investigated since the plumes were first noticed in satellite imagery in 2008. But a new study in Nature suggests that it churns up and releases carbon that’s been locked up inside sediment at the bottom of the ocean — between about 600 million and 1,500 million tons, according to the study’s initial estimates, which is about the same amount as the global aviation industry.