7 Short Articles on Climate Change Count As 1 for Rdps & Rdgs. Notes Sheets

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[7 short articles on climate change count as 1 for RDPs & Rdgs. Notes Sheets]

Earth’s Most Famous Climate Scientist Issues Bombshell Sea Level Warning

By Eric Holthaus

July 20, 2015

http://www.slate.com/blogs/the_slatest/2015/07/20/sea_level_study_james_hansen_issues_dire_climate_warning.html?wpsrc=sh_all_dt_tw_top

In what may prove to be a turning point for political action on climate change, a breathtaking new study casts extreme doubt about the near-term stability of global sea levels.

The study—written by James Hansen, NASA’s former lead climate scientist, and 16 co-authors, many of whom are considered among the top in their fields—concludes that glaciers in Greenland and Antarctica will melt 10 times faster than previous consensus estimates, resulting in sea level rise of at least 10 feet in as little as 50 years. The study, which has not yet been peer-reviewed, brings new importance to a feedback loop in the ocean near Antarctica that results in cooler freshwater from melting glaciers forcing warmer, saltier water underneath the ice sheets, speeding up the melting rate. Hansen, who is known for being alarmist and also right, acknowledges that his study implies change far beyond previous consensus estimates. In a conference call with reporters, he said he hoped the new findings would be “substantially more persuasive than anything previously published.” I certainly find them to be.

To come to their findings, the authors used a mixture of paleoclimate records, computer models, and observations of current rates of sea level rise, but “the real world is moving somewhat faster than the model,” Hansen says.

Hansen’s study does not attempt to predict the precise timing of the feedback loop, only that it is “likely” to occur this century. The implications are mindboggling: In the study’s likely scenario, New York City—and every other coastal city on the planet—may only have a few more decades of habitability left. That dire prediction, in Hansen’s view, requires “emergency cooperation among nations.”

We conclude that continued high emissions will make multi-meter sea level rise practically unavoidable and likely to occur this century. Social disruption and economic consequences of such large sea level rise could be devastating. It is not difficult to imagine that conflicts arising from forced migrations and economic collapse might make the planet ungovernable, threatening the fabric of civilization.

The science of ice melt rates is advancing so fast, scientists have generally been reluctant to put a number to what is essentially an unpredictable, nonlinear response of ice sheets to a steadily warming ocean. With Hansen’s new study, that changes in a dramatic way. One of the study’s co-authors is Eric Rignot, whose own study last year found that glacial melt from West Antarctica now appears to be “unstoppable.” Chris Mooney, writing for Mother Jones, called that study a “holy shit” moment for the climate.

One necessary note of caution: Hansen’s study comes via a nontraditional publishing decision by its authors. The study will be published in Atmospheric Chemistry and Physics, an open-access “discussion” journal, and will not have formal peer review prior to its appearance online later this week. The complete discussion draft circulated to journalists was 66 pages long, and included more than 300 references. The peer review will take place in real time, with responses to the work by other scientists also published online. Hansen said this publishing timeline was necessary to make the work public as soon as possible before global negotiators meet in Paris later this year. … [Dunn cut rest for space reasons]

U.N. Panel Issues Its Starkest Warning Yet on Global Warming

By JUSTIN GILLIS

New York Times

http://www.nytimes.com/2014/11/03/world/europe/global-warming-un-intergovernmental-panel-on-climate-change.html

NOV. 2, 2014

COPENHAGEN — The gathering risks of climate change are so profound that they could stall or even reverse generations of progress against poverty and hunger if greenhouse emissions continue at a runaway pace, according to a major new United Nations report.

Despite growing efforts in many countries to tackle the problem, the global situation is becoming more acute as developing countries join the West in burning huge amounts of fossil fuels, the Intergovernmental Panel on Climate Change said here on Sunday.

Failure to reduce emissions, the group of scientists and other experts found, could threaten society with food shortages, refugee crises, the flooding of major cities and entire island nations, mass extinction of plants and animals, and a climate so drastically altered it might become dangerous for people to work or play outside during the hottest times of the year.

“Continued emission of greenhouse gases will cause further warming and long-lasting changes in all components of the climate system, increasing the likelihood of severe, pervasive and irreversible impacts for people and ecosystems,” the report found.

In the starkest language it has ever used, the expert panel made clear how far society remains from having any serious policy to limit global warming.

Doing so would require leaving the vast majority of the world’s reserves of fossil fuels in the ground or, alternatively, developing methods to capture and bury the emissions resulting from their use, the group said.

If governments are to meet their own stated goal of limiting the warming of the planet to no more than 3.6 degrees Fahrenheit, or 2 degrees Celsius, above the preindustrial level, they must restrict emissions from additional fossil-fuel burning to about 1 trillion tons of carbon dioxide, the panel said. At current growth rates, that budget is likely to be exhausted in something like 30 years, possibly less.

Yet energy companies have booked coal and petroleum reserves equal to several times that amount, and they are spending some $600 billion a year to find more. Utilities and oil companies continue to build coal-fired power plants and refineries, and governments are spending another $600 billion or so directly subsidizing the consumption of fossil fuels.

By contrast, the report found, less than $400 billion a year is being spent around the world to reduce emissions or otherwise cope with climate change. That is a small fraction of the revenue spent on fossil fuels — it is less, for example, than the revenue of a single American oil company, ExxonMobil.

The new report comes just a month before international delegates convene in Lima, Peru, to devise a new global agreement to limit emissions, and it makes clear the urgency of their task.

Appearing Sunday morning at a news conference in Copenhagen to unveil the report, the United Nations secretary general, Ban Ki-moon, appealed for strong action in Lima.

“Science has spoken. There is no ambiguity in their message,” Mr. Ban said. “Leaders must act. Time is not on our side.”

Yet there has been no sign that national leaders are willing to discuss allocating the trillion-ton emissions budget among countries, an approach that would confront the problem head-on, but also raise deep questions of fairness…. [Dunn cut some for space reasons]

The Intergovernmental Panel on Climate Change is a scientific body appointed by the world’s governments to advise them on the causes and effects of global warming, and potential solutions. The group, along with Al Gore, was awarded the Nobel Peace Prize in 2007 for its efforts to call attention to the climate crisis.

The new report is a 175-page synopsis of a much longer series of reports that the panel has issued over the past year. It is the final step in a five-year effort by the body to analyze a vast archive of published climate research….

A core finding of the new report is that climate change is no longer a distant threat, but is being felt all over the world. “It’s here and now,” Rajendra K. Pachauri, the chairman of the panel, said in an interview. “It’s not something in the future.”

The group cited mass die-offs of forests, such as those killed by heat-loving beetles in the American West; the melting of land ice virtually everywhere in the world; an accelerating rise of the seas that is leading to increased coastal flooding; and heat waves that have devastated crops and killed tens of thousands of people…. [Dunn cut rest for space reasons]

IPCC climate report: human impact is 'unequivocal'

UN secretary-general urges global response to clear message from scientists that climate change is human-induced

Fiona Harvey in Stockholm

http://www.theguardian.com/environment/2013/sep/27/ipcc-climate-report-un-secretary-general

27 September 2013

World leaders must now respond to an "unequivocal" message from climate scientists and act with policies to cut greenhouse gas emissions, the United Nations secretary-general urged on Friday.

Introducing a major report from a high level UN panel of climate scientists, Ban Ki-moon said, "The heat is on. We must act."

In their starkest warning yet, following nearly seven years of new research on the climate, the Intergovernmental Panel on Climate Change (IPCC) said it was "unequivocal" and that even if the world begins to moderate greenhouse gas emissions, warming is likely to cross the critical threshold of 2C by the end of this century. That would have serious consequences, including sea level rises, heatwaves and changes to rainfall meaning dry regions get less and already wet areas receive more.

In a crucial reinforcement of their message – included starkly in this report for the first time – the IPCC warned that the world cannot afford to keep emitting carbon dioxide as it has been doing in recent years. To avoid dangerous levels of climate change, beyond 2C, the world can only emit a total of between 800 and 880 gigatonnes of carbon. Of this, about 530 gigatonnes had already been emitted by 2011.

That has a clear implication for our fossil fuel consumption, meaning that humans cannot burn all of the coal, oil and gas reserves that countries and companies possess. As the former UN commissioner Mary Robinson told the Guardian last week, that will have "huge implications for social and economic development." It will also be difficult for business interests to accept.

The central estimate is that warming is likely to exceed 2C, the threshold beyond which scientists think global warming will start to wreak serious changes to the planet. That threshold is likely to be reached even if we begin to cut global greenhouse gas emissions, which so far has not happened, according to the report.

Other key points from the report are:

• Atmospheric concentrations of carbon dioxide, methane and nitrous oxide are now at levels "unprecedented in at least the last 800,000 years."

• Since the 1950's it's "extremely likely" that human activities have been the dominant cause of the temperature rise.

• Concentrations of CO2 and other greenhouse gases in the atmosphere have increased to levels that are unprecedented in at least 800,000 years. The burning of fossil fuels is the main reason behind a 40% increase in C02 concentrations since the industrial revolution.

• Global temperatures are likely to rise by 0.3C to 4.8C, by the end of the century depending on how much governments control carbon emissions.

• Sea levels are expected to rise a further 26-82cm by the end of the century.

• The oceans have acidified as they have absorbed about a third of the carbon dioxide emitted.

Thomas Stocker, co-chair of the working group on physical science, said the message that greenhouse gases must be reduced was clear. "We give very relevant guidance on the total amount of carbon that can't be emitted to stay to 1.5 or 2C. We are not on the path that would lead us to respect that warming target [which has been agreed by world governments]."

He said: "Continued emissions of greenhouse gases will cause further warming and changes in all components of the climate system. Limiting climate change will require substantial and sustained reductions of greenhouse gas emissions."

Though governments around the world have agreed to curb emissions, and at numerous international meetings have reaffirmed their commitment to holding warming to below 2C by the end of the century, greenhouse gas concentrations are still rising at record rates.

Rajendra Pachauri, chair of the IPCC, said it was for governments to take action based on the science produced by the panel, consisting of thousands of pages of detail, drawing on the work of more than 800 scientists and hundreds of scientific papers.

"Heatwaves are very likely to occur more frequently and last longer. As the earth warms, we expect to see currently wet regions receiving more rainfall, and dry regions receiving less, although there will be exceptions," Stocker said.

Qin Dahe, also co-chair of the working group, said: "As the ocean warm, and glaciers and ice sheets reduce, global mean sea level will continue to rise, but at a faster rate than we have experienced over the past 40 years."

Game Over for the Climate

The science of the situation is clear — it’s time for the politics to follow

by James Hansen

Published on Thursday, May 10, 2012 by The New York Times

[Dr. James Hansen is director of NASA's Goddard Institute for Space Studies and adjunct professor in the department of earth and environmental sciences at Columbia University. He was the first scientist to warn the US Congress of the dangers of climate change and writes here as a private citizen.]

Global warming isn’t a prediction. It is happening. That is why I was so troubled to read a recent interview with President Obama in Rolling Stone in which he said that Canada would exploit the oil in its vast tar sands reserves “regardless of what we do.”

If Canada proceeds, and we do nothing, it will be game over for the climate.

Canada’s tar sands, deposits of sand saturated with bitumen, contain twice the amount of carbon dioxide emitted by global oil use in our entire history. If we were to fully exploit this new oil source, and continue to burn our conventional oil, gas and coal supplies, concentrations of carbon dioxide in the atmosphere eventually would reach levels higher than in the Pliocene era, more than 2.5 million years ago, when sea level was at least 50 feet higher than it is now. That level of heat-trapping gases would assure that the disintegration of the ice sheets would accelerate out of control. Sea levels would rise and destroy coastal cities. Global temperatures would become intolerable. Twenty to 50 percent of the planet’s species would be driven to extinction. Civilization would be at risk.

That is the long-term outlook. But near-term, things will be bad enough. Over the next several decades, the Western United States and the semi-arid region from North Dakota to Texas will develop semi-permanent drought, with rain, when it does come, occurring in extreme events with heavy flooding. Economic losses would be incalculable. More and more of the Midwest would be a dust bowl. California’s Central Valley could no longer be irrigated. Food prices would rise to unprecedented levels.