Ocean Carbon Cycle and Ecosystems

The video discusses the ocean's crucial role in absorbing carbon emissions and its importance in combating climate change. It introduces the concept of blue carbon, which is carbon captured by marine ecosystems. Coastal ecosystems like mangroves and salt marshes are highlighted for their efficiency in carbon sequestration. The video also explores offshore systems, including seabed sediments and marine animals, in carbon storage. Challenges such as overfishing and habitat loss are addressed, emphasizing the need for conservation to protect these vital ecosystems.

What fraction of human carbon emissions has the ocean absorbed since the Industrial Revolution?

• One-third

• One-half

• One-fourth

• Two-thirds

Which of the following is NOT a threat to the ocean's ability to store carbon?

• Coastal development

• Overfishing

• Pollution

• Solar radiation

What is 'blue carbon'?

• Carbon found in fossil fuels

• Carbon stored in the atmosphere

• Carbon captured by marine ecosystems

• Carbon emissions from vehicles

Which coastal ecosystem is known for sequestering carbon ten times faster than some mature tropical forests?

• Salt marshes

• Mangrove forests

• Seagrass meadows

• Coral reefs

What percentage of global coverage have salt marshes lost?

• 50%

• 25%

• 75%

• 10%

Where is carbon stored in offshore ocean systems?

• In freshwater lakes

• In seabed sediments and marine life

• In the atmosphere

• In desert sands

How do marine forests of kelp contribute to carbon sequestration?

• By trapping carbon and sinking to the ocean floor

• By releasing carbon into the atmosphere

• By absorbing carbon from the soil

• By converting carbon into oxygen

What role do fish play in the ocean's carbon cycle?

• They release carbon into the atmosphere

• They transport carbon-rich waste to deeper ocean layers

• They prevent carbon from entering the ocean

• They convert carbon into nitrogen

What is a major consequence of overfishing on the ocean's carbon cycle?

• Enhanced carbon sequestration

• No impact on carbon levels

• Disruption of carbon cycling

• Increased carbon storage

Why is it important to protect marine ecosystems?

• To increase tourism

• To reduce ocean salinity

• To promote urban development

• To preserve their climate benefits