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Climate change driving dramatic rise in sea levels: NASA

The researchers said that the speed of the acceleration can be affected by geological events such as volcanic eruptions or by climate patterns such as El Nino and La Nina

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This year NASA discovered few earth like planets. Wikimedia Commons
This year NASA discovered few earth like planets. Wikimedia Commons
  • Sea levels are at the risk of rising due to rapid climate change
  • Sea levels are expected to rise twice as high by 2100
  • It is now high time we do something about the climate change

The sea level may rise twice as high by 2100 as previously estimated as a result of climate change, a new NASA study says.

According to the findings detailed in the journal Proceedings of the National Academy of Sciences, arise in sea level may increase by up to 65 centimetres in the next 80 years, enough to cause significant problems for coastal cities, Space.com reported on Friday.

ISS is a permanent base for astronauts stationed in the outer sky. Wikimedia Commons
Sea levels are rising due to climate change: NASA. Wikimedia Commons

“This is almost certainly a conservative estimate,” said Steve Nerem, Professor at the University of Colorado-Boulder, who led the NASA Sea Level Change team that conducted the study.

This acceleration has been driven mainly by increased ice melting in Greenland and Antarctica, the study said.

Also Read: Space station crew will experience New Year’s Eve 16 times, says NASA

The findings are based on 25 years of NASA and European satellite data.

Sea levels are constantly rising which is a matter of great concern. www.austradesecure.com
Sea levels are constantly rising which is a matter of great concern. www.austradesecure.com

“Our extrapolation assumes that sea level continues to change in the future as it has over the last 25 years. Given the large changes we are seeing in the ice sheets today, that is not likely,” Nerem said in a statement.

Rising concentrations of greenhouse gases in Earth’s atmosphere increase the temperature of air and water, which causes sea level to rise in two ways.

First, warmer water expands, and this “thermal expansion” of the ocean has contributed about half of the seven centimetres of global mean sea level rise that has been observed over the past 25 years, Nerem said.

Second, the water from melting land ice flows into the ocean, which also increases sea level around the world. The rate of sea level rise has risen from about 2.5 millimetres per year in the 1990s to about 3.4 millimetres per year today, the researchers said.

NASA
NASA constantly monitors climate change and its effects.

These increases have been measured by satellite altimeters since 1992, including the TOPEX/Poseidon, Jason-1, Jason-2, and Jason-3 missions, which have been jointly managed by NASA, France’s Centre national d’etudes spatiales, the European Organisation for the Exploitation of Meteorological Satellites, and the US National Oceanic and Atmospheric Administration.

Also Read: NASA’s Kepler Discovers Nearly 100 New Exoplanets

The researchers said that the speed of the acceleration can be affected by geological events such as volcanic eruptions or by climate patterns such as El Nino and La Nina.

They used climate models and other data sets to account for the volcanic effects and to determine the El Nino /La Nina effects, ultimately uncovering the underlying rate and acceleration of sea level rise. IANS

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Students Worldwide Skip School to Protest Government’s Failure against Global Warming

They're angry at their elders, and they're not taking it sitting down

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global warming, climate change
Students from different institutions hold placards and banners as they participate in a climate protest in New Delhi, India, March 15, 2019. VOA

They’re angry at their elders, and they’re not taking it sitting down.

Students worldwide are skipping class Friday to take to the streets to protest their governments’ failure to take sufficient action against global warming.

The coordinated “school strikes,” being held from the South Pacific to the edge of the Arctic Circle, were inspired by 16-year-old Swedish activist Greta Thunberg, who began holding solitary demonstrations outside the Swedish parliament last year.

Since then, the weekly protests have snowballed from a handful of cities to hundreds, driven by social media-savvy students and dramatic headlines about the impact of climate change.

climate change, global warming
Students attend a protest ralley of the “Friday For Future Movement” in Berlin, Germany, March 15, 2019. VOA

Thunberg, who was recently nominated for the Nobel Peace Prize, was cheered for her blunt message to leaders at the World Economic Forum in Switzerland this year, when she told them: “I want you to panic. I want you to feel the fear I feel every day.”

Friday’s rallies are expected to be one of the biggest international actions yet. Protests were under way or planned in cities in more than 100 countries, including Hong Kong; New Delhi; Wellington, New Zealand; and Oulo, Finland.

In Berlin some 10,000 protesters, most of them young students, gathered in a downtown square, waving signs with slogans such as “There is no planet B” and “Climate Protection Report Card: F” before a march through the capital’s government quarter. The march was to end with a demonstration outside Chancellor Angela Merkel’s office.

Organizer Carla Reemtsma, a 20-year-old university student, said social media had been key in reaching people directly to coordinate the massive protests in so many different locations, noting that she was in 50 WhatsApp groups and fielding some 30,000 messages a day.

“It’s really important that people are getting together all over the world, because it’s affecting us all,” she said.

Critics, supporters

Some politicians have criticized the students, suggesting they should be spending their time in school, not on the streets.

“One can’t expect children and young people to see all of the global connections, what’s technically reasonable and economically possible,” said the head of Germany’s pro-business Free Democratic Party, Christian Lindner. “That’s a matter for professionals.”

climate change, global warming
Students hold signs during a rally for global climate strike for future in Seoul, South Korea, March 15, 2019. VOA

But scientists have backed the protests, with thousands signing petitions in support of the students in Britain, Finland and Germany.

“We are the professionals and we’re saying the young generation is right,” said Volker Quaschning, a professor of engineering at Berlin’s University of Applied Sciences.

“We should be incredibly grateful and appreciative of their bravery,” said Quaschning, one of more than 23,000 German-speaking scientists to sign a letter of support this week. “Because in a sense, it’s incredibly brave not to go to school for once.”

Scientists have warned for decades that current levels of greenhouse gas emissions are unsustainable, so far with little effect. In 2015, world leaders agreed in Paris to a goal of keeping the Earth’s global temperature rise by the end of the century well below 2 degrees Celsius (3.6 degrees Fahrenheit).

Yet at present, the world is on track for an increase of 4 degrees Celsius, which experts say would have far-reaching consequences for life on the planet.

“As a doctor, I can say it makes a big difference whether you’ve got a fever of 41 degrees Celsius (105.8 Fahrenheit) or 43 C (109.4 F),” said Eckart von Hirschhausen, a German scientist who signed the call supporting striking students. “One of those is compatible with life, the other isn’t.”

Other action

German Chancellor Angela Merkel and French President Emmanuel Macron have publicly welcomed the student protests, even as their policies have been criticized as too limited by environmental activists.

In France, activist groups launched legal action this week for failing to do enough to fight climate change, citing a similar successful effort in the Netherlands.

climate change, global warming
Hundreds of schoolchildren take part in a climate protest in Hong Kong, March 15, 2019. VOA

In Germany, environmental groups and experts have attacked government plans to continue using coal and natural gas for decades to come. Activists say that countries like Germany should fully “decarbonize” by 2040, giving less-advanced nations a bit more time to wean themselves off fossil fuels while still meeting the Paris goal globally.

Other changes needed to curb greenhouse gas emissions include ramping up renewable energy production, reining in over-consumption culture now spreading beyond the industrialized West and changing diets, experts say.

“The fight against climate change is going to be uncomfortable, in parts, and we need to have a society-wide discussion about this,” said Quaschning.

ALSO READ: The Flamboyant Plastic Waste Boat Reminds The Global Policy-Makers The Urgency To Address Impact Of Plastics on The World’s Marine Environment

That conversation is likely to get louder, with several U.S. presidential hopefuls planning to campaign on climate change.

Luisa Neubauer, one of the Berlin group organizing Fridays for Future, said politicians should take note of the young.

“For the European elections in May, we’re urging everyone to think about whether they want to give their vote to a party that doesn’t have a plan for the future and the climate,” she said. (VOA)