- Old dams die well: Dams weaken due to direct effects of global warming, extreme heat and unpredictable heavy rains.

- According to scientists, most of the dams built in the 1970s, like the one on Wadi Derna, are in poor condition. At that time, a thousand dams were built every year around the world. There was no earthquake-proof technology and no awareness of the effects of global warming, so most dams were built without much thought for the future. Since the 1980s, the consumption of fuel including petrol has increased in the world, so global warming has started to increase. Most of the dam structures have weakened due to the frequent occurrence of sudden heavy rains and water coming with more force than the dam zinc can withstand.

The tragedy that devastated the city of Derna in Libya when two Dams on the Wadi Derna river collapsed has shocked everyone. Officially, 12 thousand people have died in this tragedy and more than 20 thousand people are missing. It can be estimated from that what kind of blackness the water would have behaved.

Weather experts consider this tragedy as a warning to the whole world. He believes that more than a thousand dams in the world, such as the two dams on the river Derna, are at risk as a result of problems caused by global Warming. Due to this, he has warned that other such tragedies may occur in other countries of the world in the near future.

Both the dams broke after the dangerous storm, Storm Daniel, brought heavy rain and gale force winds in the first week of September. The water of the dam overflowed in the city of Derna, in which a third of the population of the city of Derna, which has a population of about 90 thousand, was submerged. The city of Derna is located on the shores of the Mediterranean Sea, so most of the people have been eaten by the sea.

About four thousand bodies were found after the water receded in the city of Derna. After that, three hundred to four hundred corpses are dragged from the sea to the shore every day and piles of corpses are piled up. In this way, the death toll has reached around 12 thousand. More than 20 thousand people are still missing. It has been more than a fortnight since the dam broke, so most of the bodies are believed to have been eaten by sea fish, so it is unlikely that more bodies will be found, but those who are missing have not returned, so they are considered dead.

Many factors are blamed for the tragedy in Libya, but the main one is global warming. There have long been warnings about the problems caused by global warming, but the Derna disaster has drawn attention to a threat people were unaware of.

According to scientists at the World Weather Attribution Group, Libya has been mired in civil war for years so the administration is in shambles. There is no such thing as a government and when nothing is done to maintain the law and order situation, there is no hope that the dam will be maintained and maintained. No one looked at this dam in the last many years so poor maintenance is one of the reasons but the dam suffered a major blow due to excessive rainfall.

The rainfall in Libya due to global warming is unimaginable. The rains that fell one and a half times the normal rainfall caused the dams to fail and the houses were destroyed. Due to global warming the weather patterns have changed so sometimes there is extreme heat and sometimes there is unexpected heavy rain. Because of that also the dam has weakened.

The location of Derna city is also unique. On one side of the city of Derma is a mountain called Jebel Akhdar (Green Mountain), on the other side is the sea and on the third side is the desert. Because of this, global warming has had the worst impact on this area. Both the dams on Wadi Derna have weakened due to constant humid winds from the sea on one hand and scorching heat from the desert in summer.

According to scientists, this is the case with most of the dams built in the 1970s, like the one on Wadi Derna. Around the world, at that time, the bet to build dams on rivers and use their water for development began. A thousand dams were built every year around the world. At that time there was no such thing as earthquake-proof technology and there was no awareness of the effects of global warming, so most dams were built without much thought for the future.

It was not the fault of the engineers or anyone else because no one had any idea that in the future the weather would be completely up and down due to global warming. Since the 1980s, the world's consumption of fuels, including petrol, increased, so global warming began to increase, which affected most of the old structures, as well as the dams of the 1970s.

Over the past decade or so, due to increased global warming, sudden heavy rains have become more frequent and water comes in with more force than the dams can handle, which has weakened the construction of most of the dams. As a result, all these dams have become ticking time bombs that can burst at any time, destroying not only entire cities but large areas around them.

Scientists are of the opinion that these dams should be closed as they pose a threat to people's lives in that country. It is done in developed countries including America. If any dam is in danger of collapsing, an alternate dam is constructed to prevent water from reaching the dam and the lake behind the dam is emptied.

Developed countries avoid the threat by changing the flow of the river in one way but not all countries of the world have that ability. Most of the dams that pose a threat to the world are in Africa and Asia, which do not have the money or technology to build new dams. In these circumstances, the only option left is to evacuate the surrounding areas and move people to a safer place.

- Iraq's Mosul, the world's most dangerous dam

The most dangerous dam in the world is the Mosul Dam on the Tigris River in Iraq. Mosul Dam, formerly known as Saddam Dam, provides electricity to the entire city of Mosul and irrigation water to a large surrounding area. The population of Mosul is around 17 lakhs. Apart from electricity, this dam provides all the water needs of Mosul.

The Mosul Dam, built under Saddam Hussein, became operational in 1985, so it is 38 years old, but its foundations have weakened due to changes in the soil structure. Due to this, there is a warning that the dam will burst anytime. If the Mosul dam breaks, the entire city of Mosul and hundreds of surrounding villages will be destroyed within hours. Scientists have warned that about fifty lakh people will die. Following the warning, the Iraqi government also awarded a contract to strengthen the foundation of the dam, but due to continuous attacks by terrorist organizations including the Islamic State, the laborers are unwilling to work on the dam, so nothing has been done for years. As a result, Mosul Dam has become the most dangerous dam in the world.

- India's Idukki Dam also in Dangerous Dams List

Apart from aging dams, some dams can also be dangerous to people due to their construction. Hoover Dam on the Colorado River in America, Almendra Dam on the Tornes River in Spain, Jinping-1 Dam on the Yalong River in China, Kariba Dam on the Zambezi River in Zambia and Zimbabwe are considered to be ticking time bombs. There is a danger that this dam will collapse and kill millions of people.

Idukki Dam in Kerala in India also comes in this list. This dam built on the Periyar River is operational since 1976. The 554 feet high Idukki Dam, jointly built by India and Canada, generates 780 megawatts of electricity. Apart from the Idukki dam, two other dams together form a huge artificial lake spread over 60 square kilometers. The construction of this dam is also 50 years old, so it can become a danger.