Will global warming make Antarctica habitable?
Who will be hardest hit by climate change?
We already have less snow in winter than there was a few decades ago. In return, the plant growth begins earlier in the year and we can now bathe well into autumn. But the lack of white splendor and the longer bathing season are among the more harmless consequences of the rise in temperature.
No country on earth will be spared from climate change. When the sea level rises, large areas of land on all coasts of the world will be flooded. For rich countries like Germany or the Netherlands this is expensive, but not an insoluble problem. Here dams are built against the floods, which can withstand a strong rise in water.
The situation is different in poor countries: large parts of Bangladesh, for example, are only a few meters above sea level - and the poor country cannot afford expensive coastal protection. If the sea level rises by one meter, many millions of people lose their homes and have to relocate. The Maldives and the South Sea islands of Tuvalu can be even worse: These islands protrude only a few meters above sea level and could be completely flooded - an entire country would then have to move.
Regions that are dependent on the glaciers' freshwater reservoirs are particularly affected by climate change: If these glaciers thaw, there is a risk of flooding at first, and then, in the long term, of severe drought. Areas in the Himalayas and the Andes are particularly at risk. In the future, over 200 million people could sit there on dry land, will have hardly any drinking water and will not be able to irrigate their fields.
Increasing water shortages also threaten the arid regions that are spreading further on earth. In 2011, for example, East Africa experienced a drought from which hundreds of thousands of people had to flee. Thousands were killed in the disaster. Many countries lack the money to protect themselves from climate change and its consequences. And it is often precisely the countries that produce only a few greenhouse gases that are particularly hard hit by the effects of climate change.
The rise in sea levels could soon doom the Maldives. If climate change is not stopped, much of the islands will be submerged by 2100. President Mohamed Nasheed wants to raise awareness of this threat. So he went to a diving station with his cabinet.
It was a spectacular action: Maldives President Mohamed Nasheed jumped into the turquoise blue sea in a diving suit, followed by his eleven ministers. The cabinet held a climate conference on the ocean floor. The message to the rest of the world: Save the Maldives from ruin!
The Maldives are best known as a vacation paradise. But the islands in the Indian Ocean are threatened by climate change: their highest point is only two and a half meters above sea level. And if the water continues to rise due to global warming, that will soon mean “land under” for the dream islands. According to climate researchers, an increase of 20 to 60 centimeters would be enough to make the Maldives largely uninhabitable. In addition, storms and storm surges are becoming more frequent due to climate change - the situation for the island nation is getting worse.
The coral reefs around the islands form a protective barrier against storm surges. But these too are suffering from climate change and some of them are already badly damaged.
Corals in danger
A colorful underwater world is what makes the Maldives so special. Coral reefs, which are home to many marine animals and plants, surround the islands. The reefs are a natural protective barrier from the tides. With a gently rising sea level, the reefs could even grow with it - provided they are healthy. But this is where the problem begins: the reefs themselves are threatened by climate change and are already badly damaged. This is due to the so-called coral bleaching, also known as "coral bleaching". The coral sticks initially bleach and eventually die. This disease is caused by the warming of the sea. Because coral bleaching occurs not only around the Maldives, but already in many places, it is considered a global threat to reefs.
It is the mightiest of all Alpine glaciers: the Aletsch Glacier in the Bernese Alps is over 23 kilometers in length. Its ice cover is up to 900 meters thick. Still! Because the white splendor of the glaciers could soon be history.
For decades, researchers have observed that the ice masses are decreasing. They lose an average of half a meter in thickness every year. Climate change is to blame, which is causing temperatures on earth to rise: In the ever warmer summers, more ice melts than is added again in the cold season. The ice giant was particularly troubled by the hot summer of 2003: At that time, large parts of the glaciers had melted away. It is now even feared that the alpine glaciers could have disappeared in 30 years.
That would be a great loss for the landscape of the Alps - and a catastrophe for tourism: many winter sports locations make their living from ski areas on glaciers. When the ice and snow melt, tourists stay away too. In addition, there will be problems with the water supply when the glaciers die. Because huge amounts of fresh water are stored in their ice masses. Many places would then have to transport their drinking water expensively and from far away.
Cling film for glaciers
To protect their glaciers from rising temperatures, the Austrians have come up with something: they cover their glaciers with plastic cling film in summer. The almost four millimeter thick, white film is supposed to reflect the sun's rays and thus prevent ice and snow from melting. And indeed: Glacier researchers confirm that the film greatly reduces melting.
Glacier foils are now also being used in Switzerland and Germany. The Zugspitze now also gets a “sun hat” on a regular basis. Climate activists criticize that while this slows down the melting of the ice for some time, global warming cannot be stopped in this way.
East Africa is experiencing the worst drought in 60 years. Hardly a drop of rain has fallen in seven months - with catastrophic consequences: the harvest has dried up, water is scarce, and millions of people are hungry and thirsty. Hundreds of thousands of Somalis are fleeing across the border into Kenya and Ethiopia. But the refugee camps there have long been overcrowded.
Due to the lack of water, neither fields can be watered nor cattle supplied. Poor harvests mean that food prices continue to skyrocket. Political conflicts in Somalia, a country with a civil war, make the situation even worse. And the drought continues.
The United Nations has already declared famine in five areas of Somalia. More than twelve million people are dependent on outside help, hundreds of thousands are on the run. In July, 40,000 starving people arrived in Dadaab, the largest refugee camp in northern Kenya, and more than a thousand more every day. But even when they reach the camps - for many refugees from hunger, any help comes too late: More and more people are dying of malnutrition.
Because the onslaught of refugees continues, more emergency shelters must be built quickly. Drinking water and hygienic supplies in the camps are becoming scarce, and living conditions are deteriorating every day. Aid organizations call for donations worldwide.
When the rain stops
Somalia once had two reliable rainy seasons, they were called Gu and Deyr. If they failed, it was a rare disaster. Grandchildren and great-grandchildren were told about it. But for a few decades now, droughts have been increasing in Somalia and East Africa. In the last five years there has only been one with the usual rainy seasons. It is probably not a coincidence. Climate experts have long predicted that climate change will spread the earth's arid zones. Africa will therefore be plagued by droughts even more in the future. In East Africa this suspicion is being confirmed in a shocking way.
The global warming
It is getting warmer and warmer on earth. In the last hundred years alone, the average temperature has risen by almost one degree Celsius. The main reason for this warming is the increased proportion of carbon dioxide in the air. This CO2-The main cause of the increase is the industrialized countries through the burning of oil, gas and coal.
Plants, on the other hand, have a protective effect on the climate. They can absorb carbon dioxide from the air and convert it into organic compounds during photosynthesis. The tropical forests store a particularly large amount of carbon dioxide. Because large areas of forest are being cleared in the tropics, this storage function is becoming ever smaller. Because where there is no tree, no more carbon dioxide is taken from the air. The greenhouse effect increases and the atmosphere warms up.
So will we soon be swimming in the lake in winter instead of sledding? Difficult to predict. Scientists are trying to calculate by how many degrees Celsius the earth will heat up in the future with the help of computer models. According to these models, the average temperature on earth could rise by a further one to six degrees by the year 2100. How the temperature curve will actually run depends above all on whether the proportion of carbon dioxide continues to rise.
The serious consequences of climate change can already be seen: The ice masses are melting, the sea level is rising, storms and droughts are increasing. It is all the more important to reduce greenhouse gas emissions, especially CO2. Because this trace gas remains in the atmosphere for a long time. Only if we blow less of it into the atmosphere can man-made climate change at least be slowed down.
Some industrialized countries have therefore committed to reducing their greenhouse gas emissions and certain CO2-Values not to be exceeded. But despite a series of climate summits, the global community has not yet succeeded in curbing the rise in carbon dioxide in the air.
The consequences of climate change
Climate change is already clearly visible in the polar regions. Just a few decades ago, the Arctic Ocean was largely covered by ice. But this ice sheet is melting due to the rising temperatures: in the last 30 years its area has almost halved. At the same time, the ice layer is getting thinner and thinner. Climate researchers have calculated that the ice could melt completely in the next 20 years. The sea level would rise by a few meters as a result. But it's not just the ice sheets on the poles that are melting. The high mountain glaciers are also losing mass.
Because the sea level rises as the ice melts, ever larger coastal areas are flooded. Low-lying island states, such as the Maldives in the Indian Ocean or Tuvalu in the Pacific, are therefore increasingly threatened by storm surges. And not only the sea level, the water temperature also rises with climate change. As a result, more water evaporates and more water vapor is stored in the air. This increases the greenhouse effect, which further heats the atmosphere. This also increases the risk of severe weather such as heavy rain and hurricanes.
In arid regions, the deserts are spreading due to rising temperatures. More and more droughts are causing rivers to dry up and areas of land that were previously green wither. In the south of Spain, for example, the usual rainfalls, which are urgently needed for agriculture, have been absent for years. And the water shortage in southern Europe continues to intensify.
All of these consequences of climate change can already be observed. Climate researchers are trying to calculate how things will continue with the help of computer models. But the future is difficult to predict because so many influences determine our climate. The salty sea water is diluted with fresh water by the melting of the glaciers. However, the salinity of the sea drives the ocean currents. So what could happen if the warm Gulf Stream breaks off due to the lower salt content? Will it be colder instead of warmer in Europe? What would happen if the permafrost thawed in the far north? Do tons of the greenhouse gas methane then escape from the ground? And will it accelerate climate change?
So far nobody can answer that exactly. With all the unanswered questions, one thing seems certain: if we don't drastically reduce our carbon dioxide emissions, temperatures on this globe will continue to rise.
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