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The cause of the gradual decrease of sea ice coverage could be from global warming. Global warming is a climate change due to human activities which affects the greenhouse effect.

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I believe that global warming is the main reason that the ice caps melted the way they did in the 30 years between those two pictures. I believe this because of the amount of the pollution has increased by over 10% causing the oceanic temperatures to rise.

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The cause of the decrease could be due to climate change and the increasing temperatures in Africa. Since it is closer to the core, it is hotter.

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Climate change could be the main reason for the gradual decrease in sea ice coverage and thickness in the Arctic. Greenhouse gases trap heat in the Earth's surface. This could be a cause of climate change.

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The reason the ice been decreasing is because the tempeture of earth been going up due to things such as economic problems such as global waming, causing the ice to melt.

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Global Warming could be the cause in why there is a decrease in ice coverage and thickness in the Arctic .It could have melt the ice and decreased it coverage around the Arctic.

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The gradual decrease of ice and thickness in the arctic can be caused by the heat of the earth melting the ice making it thinner and the ice coverage decreases because of the heat.

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The cause of the gradual decrease in sea ice coverage and thickness in the Arctic is most likely due to the increasing temperature in some places.

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Global warming could be the cause of the gradual decrease in sea ice coverage and thickness in the Arctic because as it's getting warmer the ice starts to melt making it decrease overtime.

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the cause of the gradual decrease in sea ice coverage and thickness in the arctic could be global warming. i think the gas and heat produced from vehicles and buildings has become so vast that it gets trapped in the atmosphere and melts the ice.

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I believe that the gradual decrease in sea coverage and thickness in the Arctic is caused by global warming. Pollution in the air is held in by the atmosphere and the ice is melting away because of the heat. It could also be because of the ice getting weaker over time.

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The sea ice coverage is gradually decreasing because of global warming. This is caused by humans taking too much space such as planes and producing more heat by farming.

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There could be heat flowing into the arctic. Or it could be the atmosphere melting it or taking it and change it into a gas.

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Mainly human influence like differnt materials that has gone into the ocean making the ice melt all these years. As human population grows the material used grows so everything gets worse and worse every year.

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The cause of the gradual decrease in sea coverage and thickness in the Arctic could be due to global warming. As the sun's heat waves hit the earth more and heats up the Earth, the ice in the Arctic are going to start melting.

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I believe the cause of the gradual decrease is from global warming. The gases and heat made the sea ice coverage become thin, which possibly lead it to completely melt.

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The reason why the glacier melted drastically is because of global warming over the years.

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The cause of the gradual decrease in sea ice coverage and thickness in the Arctic could be climate change. Climate change causes hotter temperatures in areas where it is supposed to be cold, like the Arctic in this case, making it hotter. This causes the ice to melt and as a result, there would be less coverage and decreased thickness of the ice.

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Causes that could be the cause of the gradual decreases in sea ice coverage and thickness in the Arctic can be because of global warming/climate change, hotter temperatures and the warming of the atmosphere. These factors can decrease in sea ice coverage.

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I believe that the total area covered by sea ice and the portion of sea ice that was more than a year old decreased significantly because of global warming. I also think it happened because the changes happened between a long period of time. I was not too surprised because it was over a 32 year time span.