Tag Archives: climate change

When Ice Sheets Melt

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The Western Antarctic Ice Sheet (WAIS) is part of the continental ice sheet covering West Antarctica on the side of the Trans-antarctic Mountains in the Western Hemisphere. It is bounded by the Ronne Ice Shelf on the North, by the Ross Ice Shelf on the Southeast, and outlet glaciers that drain into the Amundsen Sea on the Southwest. A remnant of the ice age, it is larger than Mexico and makes up 10 percent of the estimated 25.4 million cubic kilometers Antarctic ice sheet. Should it break up due to global warming, which is feared could happen sooner than anticipated, the sea level could rise by 12 feet or more.

The Western Antarctic Ice Sheet is just one region. Ice in other regions could melt too and over time the world’s coastlines will be submerged in water along with many great cities old and new. During a climatic period around 125,000 years ago, the sea level had risen to 20 to 30 feet higher compared to today’s sea level.

For half a century, scientists have been monitoring the West Antarctic Ice Sheet and had assumed that the worst effects of climate change would be realized over a span of hundreds, and even thousands of years. But new research suggests that the ice is melting at a lot faster rate than anticipated. According to a study published on March by the journal, Nature, continued high emissions of greenhouse gases would cause the disintegration of the ice sheets within decades. This would in turn cause the sea level to rise up to 3 feet by the end of this century. Beyond 2100, the situation would grow far worse as the sea could rise more than a pace of a foot per decade by the middle of the 22nd century.

While it might be possible that the actual situation could turn out far less catastrophic than anticipated, the fact that this disaster scenario has been brought to light strongly suggests that if proper measures to decelerate climate change are not put into place and strictly observed, then humanity will suffer immeasurable loss and damage. The melting of sea ice and the consequential rise in sea levels is just but one among many disaster scenarios resulting from climate change.

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The Intergovernmental Panel on Climate Change

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In 1988, the United Nations Environment Programme (UNEP) and the World Meteorological Organization (WMO) set up the an intergovernmental body tasked to evaluate the nature and implications of climate change to the environment, society and the economy.

The Intergovernmental Panel on Climate Change (IPCC), gathers from around the globe scientific, technical and socio-economic data significant to understanding climate change. However, it does not conduct research nor does it monitor climate related information. Instead, thousands of scientists from different parts of the world contribute to the work of the IPCC. To determine which information may be considered and approved, participating governments gather and discuss the collected information to reflect varied views and expertise. Currently, 195 countries are members of the IPCC.

So, what is the relevance of the IPCC?

Assessments by the IPCC provide participating governments scientific basis for developing climate-related policies. These assessments do not tell policymakers what to do exactly. Instead, they discuss possible scenarios or circumstances of future climate changes based on various situations, the dangers resulting from climate change and implications of actions that would most likely be undertaken as a response to the supposed danger of a possible scenario.

But who exactly puts together all the IPCC work? And who is in charge of communicating and coordinating with the various governments?

UNEP and WMO established the Secretariat to coordinate all the work and liaise with all members. It is a committee based at the WMO headquarters in Geneva.

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2016: Temperatures Rising

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The World Meteorological Organization report on March 2016 has confirmed that 2015 was the hottest year on record. The average global temperature was 1.37°F (0.76°C) above the average from 1961-1990. The report is based on data from the U.S. National Oceanic and Atmospheric Administration, the U.K. Met Office, and NASA.

Moreover, NOAA data indicate an unprecedented spike in global carbon dioxide levels in the atmosphere with a whopping 3.05 parts per million growth rate. It’s the fourth year in a row that the atmospheric carbon dioxide rose over 2 parts per million.

Another indication of climate change is the depressed sea ice levels. The Artic sea ice has hit a record low winter maximum extent and saw its fourth lowest summer minimum extent. The weather has also reached extremes with some parts of Asia experiencing major heat waves while much of the Pacific had a flurry of storm activity.

But what is perhaps most alarming are further reports that show the startlingly high temperatures has continued well into the first half of 2016 with no signs of a slowdown. Temperatures from April 2015 through June 2016 were record high. NASA’s records show that from January to June 2016 were the warmest respective months in the modern temperature record, which dates to 1880. The worrying data that just keeps getting worse has, in fact, prompted scientists to declare a “climate emergency.” And if the past 14 months is anything to go by, 2016 could well be in the running to beat 2015 as for the hottest year record.

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World leaders and organizations are trying to make progress in addressing the concurrent climate issue and consequential crises like drought, food and water shortages, and deaths. They gathered in record numbers at the United Nations on April 22, 2016, Earth Day, to sign the Paris Agreement, which stipulates that over 195 countries agree to take action, commit to and work together in reducing greenhouse gas emissions to keep global temperature to about 1.5°C and never above 2°C.

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Is the Current Climate Change Man-Made?

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Anthropogenic climate change refers to the major warming trend the Earth is currently experiencing due to human activities. The burning of fossil fuels the use of automobiles and machines in factories, the slash and burn practice in agriculture and the use of various chemicals add to the greenhouse gases already present in the atmosphere and those naturally produced on the planet’s surface.

But are we really to blame for the global warming and climate change? Not many really believe that human activities over the last hundred years have caused the surface temperatures to rise. Many anthropogenic climate change skeptics believe that climate change is a natural process.

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Indeed, the planet naturally is capable of causing changes in climate primarily due to how it everything within it reacts to various influences. It is these complex integrated systems and processes that probably made Earth life-sustaining in the first place. Over the last 4.6 billion years the Earth’s climate has undergone several cycles of freezing and melting.  Long before humans ever came to being, the Earth’s climate has changed dramatically due to natural process including the movement of the Earth’s crust, plant and animal respiration, volcanic activities, and solar irradiance.

However, various evidences points that there have been unusual spikes in the emissions of greenhouse gases from the Earth’s surface. That basically means that other than the naturally occurring greenhouse gases, there are other sources. Various data collected by various agencies show that post-industrialization and post-war, there have been a steady rise in greenhouse gas emissions.

According to a report by the Intergovernmental Panel on Climate Change (IPCC), the concentration of carbon dioxide in the atmosphere in 1750 was 280 parts per million (ppm) and has risen up to 379ppm by 2005. In comparison, over the past 8, 000 years and just before 1750, the atmospheric CO2 increased only by 20ppm. Moreover, at the conclusion of the most recent ice age there was an estimated 80ppm increase.

Humanity have been working towards understanding life and the universe and have learned what the Earth’s atmosphere is made up of. Humanity has understood the systems and processes that naturally occur on this planet, humanity now knows how weather becomes and what drive changes in the weather or climate, humanity knows what gases are used and emitted by machines, humanity knows how biology impacts everything else. Humanity knows the implications of human activities on the planet. Will humanity own up to the fact that the current warming trend is caused by the general human population?

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What’s Behind the Current Global Warming Trend?

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Considering that the Greenhouse Effect is consequential to life and is essential to how the planet remains habitable, then why has it been positioned in a seemingly bad light? Is it due to the current global warming trend, hastening the progress of climate change?

There is an ongoing debate whether climate change really is happening, and who’s to blame for this. Like with everything else, people just can’t agree and have different views, beliefs and data to prove their point. One set of data that has caused quite a stir reveals how the Earth’s average surface temperature has risen between 0.4 and 0.8 °C over the past 100 years. The increase in temperature has been attributed to human activities. According to scientific data, there has been a sudden and alarmingly consistent rise in carbon dioxide emissions since the 1950s, an era known as the postwar boom.

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Massive gas emissions due to industrialization has largely contributed to the increased levels of carbon dioxide. Add to that the diminishing forests and vegetation that would have greatly helped out in managing the rising levels of carbon dioxide.  The increased level of carbon dioxide and other greenhouse gases produced by human activities has tipped the balance.

The massive amount of greenhouse gases emitted from the earth’s surface by humans has increased the amount of greenhouse gases in the atmosphere, which means that more radiation is being absorbed, retained and emitted by the atmosphere back down to the surface, further increasing the surface temperature.

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Understanding Climate Change

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How’s the weather in your part of the world? Cold, sunny, windy, warm, dry, or freezing?

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Weather, simply, is the daily state of the atmosphere of a region in terms of temperature, atmospheric pressure and particle count, wind, precipitation, humidity, and other meteorological variables. Climate, on the other hand, is the statistics of the prevailing weather conditions over extended periods.

The Earth’s climate system is generated by the cyclical interactions of the planet’s atmosphere, hydrosphere, cryosphere, lithosphere, and biosphere, driven by the energy from the sun. Due to the shape and tilt of the planet, the distribution of solar energy differs in various parts of the globe, leading to differences in temperature. While some of the heat bounces off to space, what remains within is distributed throughout the planet.

The differences in heat distribution and the transference of heat give rise to the weather we experience. Fluctuations in the amount of heat in the climate system then result to changing weather patterns. Now the amount of heat in the climate system depends on the amount of trapped energy resulting from the planet’s greenhouse effect.

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How Does Greenhouse Effect Work?

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Earth is constantly bombarded by the sun’s radiation, also known as solar energy. The sun emits energy at wavelengths within the ultraviolet, visible, and infrared bands.

how-greenhouse-effect-worksThe Earth’s atmosphere is made up of gases namely, nitrogen, oxygen, argon, carbon dioxide, helium, hydrogen, methane, nitrous oxide, ozone, carbon monoxide, neon, krypton, xenon, iodine, ammonia, and water vapor.  The properties, behavior and quantity of these gases vary, but collectively, they act like a blanket that protects and keeps the Earth warm enough to promote and support life.

On the Earth’s surface, here we find bodies of water such as oceans and lakes, land masses including volcanoes, and ice located at polar regions as well as snow on high altitude land areas and tepid latitudes. It is basically the habitable zone where all living creatures thrive, and the end receiver of solar energy.

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Now, the sun’s light, heat and UV continually strikes the Earth, but the Earth somehow is able manage the amount of radiation via its ability to absorb and radiate said radiation, a process known as Greenhouse effect. How this works is analogous to how greenhouses stay warm for growing plants in parts where temperatures reach below zero, albeit through a different physical process.

When solar radiation enters the atmosphere, about a third that reaches the outer atmosphere immediately bounces off back to space. The remaining two-thirds of the solar energy is absorbed by the Earth’s surface and a portion of it by the atmosphere, and then the excess energy is radiate back out only at much longer wavelengths, generally in the infrared or thermal spectrum, since the Earth is much cooler than the sun. Ultraviolet and visible light are part of the electromagnetic spectrum, only UV radiation has shorter wavelength and a higher energy level than visible light.

While a portion escapes out to space, much of the infrared radiation is absorbed by the atmosphere. The gases within the atmosphere are able to hold and at the same time emit the energy in all directions, including back down to the surface, warming the planet.  Without this cloak of gases, the average surface temperature would be lower than the freezing point of water. The Greenhouse Effect is how the planet achieves a certain radiative equilibrium essential to life.

 

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How Does Global Warming Happen?

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Global warming generally occurs when radiation bouncing off the Earth’s surface gets trapped in the atmosphere. Certain gases in the atmosphere, called greenhouse gases, block most of the heat and radiation bouncing off the Earth’s surface from heading out to space.  So while a fraction of the heat and radiation escapes, those that are absorbed by the greenhouse gases in the atmosphere is reflected back down to the Earth’s surface. This process, called “greenhouse effect,” is basically how our planet keeps warm.

The various greenhouse gases differ widely in their properties and behavior, including their ability to absorb, retain, and emit radiation. Though, by far, carbon dioxide is cited as the major contributor for the current global warming trend as it makes up a huge percentage of the greenhouse gases present in the atmosphere. This is because aside from the naturally occurring carbon dioxide, massive amounts of this gas is produced by burning fossil fuels to produce electricity as well as to run machines and factories.

Another greenhouse gas that contribute to global warming is methane. This gas is naturally present below ground and under the sea floor.  And when it is released into the atmosphere, it becomes known as atmospheric methane. It is highly flammable and is used as fuel for ovens, heaters, turbines and many other things. Methane is also produced by certain chemical processes that occur in landfills, agriculture and marine sediments.

Two other greenhouse gases that are contributory to global warming are Nitrous oxide from fertilizers and fluorinated gases which are used for refrigeration and industrial processes.

But while Carbon Dioxide makes up majority of the greenhouse concentration in the atmosphere, Nitrous Oxide is actually 300 times more potent.  Unfortunately, despite the knowledge of how our activities are greatly affecting climate change, not much has been done to rectify the problem due to varied interests and concerns of the planet’s general population. So, will the time for a collective effort to combat global warming and preventive measures to abate the possible demise of humanity ever come to fruition?

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Is Climate Change Really Happening Now?

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Is Climate Change Really Happening Now?

 

Throughout Earth’s history, the planet’s climate has gone through several temperature fluctuations, thereby causing several cycles of glacial advance and retreat. Most of these climate changes are due to subtle variations in the planet’s orbit which varies the amount of solar energy the planet receives. Other factors include biotic processes, fluctuations in the Sun’s energy and plate tectonics.

The eventuality of a climate change is ultimately inevitable, it being a natural process as a result of Earth’s reactions to the goings on within and around it. But is climate change really happening now?

Yes, scientists have been recording compelling evidence that climate change is real and that global warming has already begun. The indicators are:

Rising Global Temperatures. Scientific reports have shown that the current global warming trend began around 1880 with some of the warmest years occurring since 1981. But what’s even more alarming is that 15 out of the top 16 warmest years in NASA’s 134-year record have taken place since the year 2000, which could only mean that the warming has greatly accelerated.

Warming Oceans and Ocean Acidification. Oceans makes up a huge portion of the planet and for good measures. These actually do a darn good job at soaking up excess heat from the atmosphere and distribute it more evenly throughout the planet. With its heat insulating capabilities, it serves as a good indicator for the changing climate and it has been noted that since 1969, up to 2,300 feet of the ocean’s surface have significant elevated temperatures. Also, as the concentration of carbon dioxide in the atmosphere increased, more I being absorbed into the oceans, increasing the acidity of surface ocean waters.

Shrinking Ice Sheets. Among many other things, there is a growing concern in the decreasing Greenland and Antarctic ice sheets. NASA’s records reveal that between 2002 and 2005, Antarctica has lost about 152 cubic kilometers of ice, while Greenland has lost between 150 to 250 cubic kilometers of ice every year between 2002 and 2006.

Declining Artic Sea Ice. Another indicator is the rapid decrease of the extent and thickness of the Arctic sea ice during recent decades.

Glacial Retreat and Decreased Snow Cover. Glaciers in various locations including the Alps, the Andes, the Himalayas, the Rockies, Alaska, and Africa are retreating, while the coverage of Spring snow in the Northern Hemisphere decreased during the last five decades.

Rising Sea Levels. With the melting of ice sheets and sea ice, sea levels have noticeably risen. In the last century, global sea level rose to about 17 centimeters. However, in the last decade, it further increased to nearly double that of the last century.

Extreme Events. Burning temperatures, pouring rains, flooding, drought, devastating earthquakes and a myriad of other natural disasters have been recorded the world over and the frequency of these occurrences have been surprisingly and alarmingly high.

These scientific evidence are very hard to ignore. So what can we do to rectify the problem. Will we still have an opportunity to do so?

 

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What is Global Warming

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Global Warming, What Does It Mean?

 

Have you noticed that it’s way hotter nowadays than let’s say, ten, five years ago? And when it rains, it pours. Wildfires are fiercer than ever, damaging hectares of wildlife. Does it not concern you how the climate has become quite extreme?

True, throughout Earth’s history, the climate has warmed, cooled, and gone to extremes one too many times. Basically, the climate does change due to a number of factors including biotic processes, subtle changes in the planet’s orbit, plate tectonics, or when the sun’s energy fluctuate. There have been a series of scorching climes that alternated with glacial periods. However, each cycle lasted several thousands of years!

So why has the climate changed faster this time around? And why is it unreasonably hot these days? First, a background on how Earth keeps warm.

Heat and radiation from the sun enter the atmosphere and gets bounced off from the surface back to the atmosphere. In the atmosphere, greenhouse gases such as carbon dioxide and methane absorb heat reflected from the Earth’s surface. These atmospheric gases trap heat for extended periods, all the while radiating heat in all directions including down back to the surface. Consequently, the Earth’s surface temperature elevates as the atmosphere continues to radiate heat.

Greenhouse gases are naturally present in the planet and has been contributory to the life-sustaining workings of the planet. However, in the past century, greenhouse gases emitted from the Earth’s surface have spiked due to burned fossil fuels, increasing the concentration of these gases in the atmosphere. So imagine the amount of greenhouse gases absorbing heat and how much heat is radiated back down to Earth’s surface, and for how long.

Global Warming may seem self-explanatory, but is the reality of it as simple as it sounds? What can and must we do to safeguard the future of the planet and humanity?

 

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