Last Tuesday and today I am setting out two different views on whether global warming is true or false. Both views have merit and both views also are questionable.

However, it is a subject that both sides have distorted the facts they rely on for their ‘truths’.

It is an important subject for us living on a small ‘flat’ island in the Caribbean.

On Tuesday I published two articles that were tied together to make a convincing claim that global warming isn’t happening.

Today I am publishing a convincing article claiming climate change “is already happening”!

10 Signs Climate Change Is Already Happening

By Kieran Mulvaney From news.discovery

There is no real debate about whether climate change is occurring. The only dissent comes from the fringes, and generally from those whose research institutions or blogs are devoted, for ideological or other reasons, to attempting to debunk the notion that human activities are altering the planet’s climate. But for many, the discussion, such as it is, can seem confusing. Is the Arctic Ocean predicted to be ice-free by the summer of 2100, or 2050, or 2030? And what exactly does ice-free mean? Are hurricanes supposed to become more frequent, or less frequent but more intense?

For scientists studying the impacts of climate change, such questions – and answers – are constantly being revised and refined as more information is gathered, models are fine-tuned, and feedbacks are better understood. But even as they focus their forecasts, those scientists are increasingly seeing the evidence of global warming happening right now, many of them in line with predictions and some of them even more severe and more rapid than anticipated. The following list provides a sampling of some of the key pieces of evidence that climate change is not just a prediction, it is already underway.

1. Carbon Dioxide Concentrations in the Atmosphere Are Increasing
This is the first, key point. By analyzing air bubbles trapped in the ice of Antarctica and Greenland, scientists have been able to determine that over the past 650,000 or so years, atmospheric concentrations of carbon dioxide (CO2) varied between 180 and 300 parts per million (ppm), and in the years immediately prior to the Industrial Revolution in the mid-eighteenth century stood at approximately 280 ppm. Since then, however, that figure has steadily increased; by the time continuous monitoring began at Mauna Loa Observatory in Hawaii, it had climbed above 310 and is now closing in on 400.

Because we know that carbon dioxide is a greenhouse gas, we can reasonably infer that increasing the amount of CO2 that enters the atmosphere, particularly at the level of 90 million tons a day, will increase the greenhouse properties of the atmosphere and thus lead to warming. (And while, as skeptics often like to point out, water vapor is a more powerful greenhouse gas than CO2, we are not emitting vast amounts of water vapor every day; indeed, the atmosphere can only hold a certain amount of atmosphere at a time. But, by warming the atmosphere, increased CO2 levels enable the retention of greater amounts of water vapor, thus enhancing warming.

Furthermore, scientists know, from analyzing the isotopes of the carbon in the atmosphere, that the increase in atmospheric CO2 is the result of burning fossil fuels and forests, and not the result of natural processes. Accordingly, a National Research Council study was able to point out back in 2001 that, “Greenhouse gases are accumulating in Earth’s atmosphere as a result of human activities, causing surface air temperatures and sub-surface ocean temperatures to rise.” Because, indeed, as that study noted, “Temperatures are, in fact, rising.”

2. The Hottest Decade on Record Keeps Changing
Whether measured from land or from satellite, it is clear that global temperatures are increasing.

Averaged over all land and ocean surfaces, global mean temperatures have increased by approximately 1.33 degrees Fahrenheit (0.74 degrees Celsius) over the past century. More than half of this warming—about 0.72 °F (0.4 °C)—has occurred since 1979. Because oceans tend to warm and cool more slowly than land areas, continents have warmed the most (about 1.26 °F or 0.7 °C since 1979), especially over the Northern Hemisphere.

Furthermore, the rate of increase is, well, increasing.

Even with year-to-year natural variations, underlying global surface and lower atmosphere warming trends are maintaining an upward trajectory.

3. The Rate of Warming Is Unprecedented in at Least 11,000 Years
Of course, Earth’s climate has historically undergone numerous significant shifts. It has been, at various times, both much warmer and much colder on average than it is now. How do we know that what is happening now is not one of those natural cycles? Well, for one thing, none of the natural forces – tilts in the planet’s axis, wobbles in its orbit, or increased solar activity – are factors (the Sun, in fact, has been going through a slight cooling cycle even as temperatures on Earth have increased). Another clue that this is human-caused is the speed at which the change is occurring.

A graphic representation of the rate of recent change has long been provided by the famous (or, depending on your point of view, infamous) “hockey stick” reconstruction, which shows a period of relatively stable temperatures followed by an upward surge beginning in the latter half of the twentieth century. Numerous studies have reinforced that finding. In 2008, 14 years after the initial reconstruction, a new version extended the stick’s ‘handle’ back over a millennium, showing that “recent warmth appears anomalous for at least the past 1,300 years.”

This year, a brand new study combined data from 73 sites around the world to show that temperatures today are warmer than they have been during 70-80 percent of the Holocene Epoch – the stretch of time, beginning about 11,300 years ago, since the last major Ice Age – and that, under all existing scenarios for different levels of greenhouse gas emissions, virtually every model shows temperatures will exceed the very hottest periods during that time. According to Candace Major of the National Science Foundation, “This research shows that we’ve experienced almost the same range of temperature change since the beginning of the industrial revolution as over the previous 11,000 years of Earth history — but this change happened a lot more quickly.”

Arctic Sea Ice Is in a ‘Death Spiral’

The extent of summer sea ice covering the Arctic Ocean is now decreasing by a rate of about 13 percent per decade, compared to the 1979-2000 average. The six lowest annual minimum extents on record have been in the last six years; in 2012, Arctic sea ice extent reached its lowest level in the satellite record, fully 760,000 square kilometers (293,000 square miles) below the previous record, which occurred in 2007. That difference is an area about the size of the state of Texas. The 2012 minimum was in turn 3.29 million square kilometers (1.27 million square miles) (or 49 percent) below the 1979 to 2000 average minimum, representing an area nearly twice the size of the state of Alaska.

Much of the ice that remains is thinner, first-year ice, rather than the thicker multiyear ice that has characterized the Arctic Ocean in the past. Because it forms each winter, it is more vulnerable to break-up and melt the following summer. The growing dominance of this thinner ice means that the volume of Arctic Ocean sea ice has also collapsed, from approximately 16,855 cubic kilometers in 1979 to roughly 3,261 cubic kilometers in 2012. In other words, Arctic sea ice has lost 80 percent of its volume. As Arctic ice becomes smaller in extent and thinner in volume, it becomes increasingly vulnerable to further melt, prompting National Snow and Ice Data Center (NSIDC) Director Mark Serreze to say it is in a “death spiral.” Some experts think we could see nearly ice-free summers in the Arctic Ocean in a decade if present trends continue.

Greenland Is Losing Ice at an Accelerating Rate

Evidence is mounting that Greenland – the second-largest ice sheet in the world after Antarctica – is losing mass at an accelerating rate. Much of this loss is occurring along Greenland’s edges, where rapidly-moving glaciers and ice streams are discharging more ice into the ocean than is being accumulated on the ice cap. To date, much of this ice loss has occurred in the southern part of the landmass, but it now appears that these losses are spreading to the northwest. Additionally, in July 2012, Greenland saw melting occur across approximately 97 percent of its surface ice.

How much ice is Greenland losing? At present, almost 300 gigatonnes per year – which, on the face of it, means we’d have to wait a long time (about 10,500 years) until the ice sheet completely dissipated. But of course, the ice sheet will contribute significantly to sea level rise long before it disappears entirely. The rate of ice loss is increasing so rapidly that just ten years ago it was extrapolated that total ice sheet dissipation would happen in 22,000 years. In other words, the amount of time until the Greenland ice sheet vanishes has been halved – reduced by 10,000 years – in just a decade. And the rate of ice loss is still increasing. Even when the news is good, it’s bad: a recent study that found the Greenland ice sheet may be more stable than we thought concluded that this may mean the Antarctic ice sheet is less stable than previously believed.

6. Antarctic Peninsula Is Also Losing Ice at an Accelerating Rate

7. The Ocean Is Warming

8. Sea Level Is Rising

9. The Planet Is Accumulating More Heat

10. Extreme Weather Is More … Extreme

To read the whole article, go to: http://news.discovery.com/earth/global-warming/10-signs-climate-change-is-already-happening-130422.htm

To find Tuesday’s Editorial on this subject go to: http://www.ieyenews.com/wordpress/the-editor-speaks-is-global-warming-true-of-false/