Arctic warming began sooner than thought, closer to human industrialisation

The video discusses the warming of oceans over decades, with a focus on a study that used marine debris to reconstruct 800 years of data. It highlights the stability of Arctic waters until the early 1900s, when heat and salt from the Atlantic began to rise, possibly due to human-induced carbon dioxide emissions. The study suggests changes in Atlantic Meridional Overturning Circulation currents may have contributed. A feedback loop is described, where melting ice leads to further warming as the dark ocean absorbs more heat.

What method was used to reconstruct 800 years of ocean data?

• Ice core samples

• Marine debris

• Satellite imagery

• Tree rings

What significant change began in the Arctic in the early 1900s?

• Decrease in marine life

• Rise in sea levels

• Increase in heat and salt from the Atlantic

• Decrease in salinity

What does the study suggest about the Arctic's sensitivity to greenhouse gases?

• It is not affected by greenhouse gases

• It is equally sensitive as other regions

• It is more sensitive than previously thought

• It is less sensitive than previously thought

What is one possible cause of early Atlantification mentioned in the study?

• Volcanic eruptions

• Changes in the Atlantic Meridional Overturning Circulation

• Increased solar activity

• Decreased ocean salinity

What happens when the Arctic ice melts, according to the feedback loop described?

• The ocean absorbs more heat

• The ocean becomes less salty

• The ocean reflects more sunlight

• The ocean currents slow down