Why the Oceans Are Getting Darker

The video discusses the human impact on the environment, focusing on a new phenomenon called coastal darkening. This occurs when parts of the ocean near land become darker, affecting the entire water column. Causes include fertilizer runoff, boat traffic, and climate change. Coastal darkening is observed globally and affects ecosystems by reducing sunlight for photosynthesis, impacting phytoplankton and marine life. It also alters ocean chemistry, potentially worsening climate change by reducing carbon sequestration by marine plants like kelp. More research is needed to understand its full impact.

What is one of the main causes of coastal darkening?

• Increased boat traffic

• Decreased rainfall

• Reduction in algae growth

• Less soil erosion

Which device is used to measure water clarity in the context of coastal darkening?

• Anemometer

• Barometer

• Secchi disk

• Thermometer

How does coastal darkening potentially affect phytoplankton?

• Changes their color

• Decreases their growth

• Increases their growth

• Has no effect

What is a potential consequence of reduced sunlight reaching methylmercury in the ocean?

• It breaks down faster

• It becomes less toxic

• It evaporates quickly

• It remains in the ecosystem longer

How might coastal darkening contribute to climate change?

• By reducing kelp's ability to sequester carbon

• By increasing carbon sequestration

• By enhancing photosynthesis in marine plants

• By decreasing ocean temperatures