The Chemistry of Global Climate Change. Chapter 3, part III Miriam L. Wahl, PhD. Fig03.24. Scientists make predictions by following trends and patterns; using computer simulations. Table 03.03. Suggestions to counter climate change. Planting green plants on roofs Painting roofs white
Chapter 3, part III
Miriam L. Wahl, PhD
Scientists make predictions by following trends and patterns; using computer simulations
Receding glacier in Alaska
Recognizing the problem of potential global climate change, the World Meteorological Organization (WMO) and the United Nations Environment Programme (UNEP) established the Intergovernmental Panel on Climate Change (IPCC) in 1988. It is open to all members of the UN and WMO.
In 2007, the IPCC stated in a report that scientific evidence for
global warming was unequivocal and that human activity is the
The Kyoto Protocol, an international and legally binding agreement to reduce greenhouse gases emissions worldwide, entered into force on 16 February 2005.
Notable country who has not signed
In an attempt to clear the air, National Geographic News checked in with Eric Steig, an earth scientist at the University of Washington in Seattle, who saw An Inconvenient Truth at a preview screening.
He says the documentary handles the science well.
"I was looking for errors," he said.
"But nothing much struck me as overblown or wrong."
Claim: According to the film, the number of Category 4 and Category 5 hurricanes has almost doubled in the last year.
"This is true," Steig said. "There is no theoretical basis for the notion that this is a [natural] cycle."
A study published in the journal Nature in August found that hurricanes and typhoons have become more powerful over the past 30 years.
The study also found that these upswings in hurricane strength correlate with a rise in sea-surface temperatures. Ocean heat is the key ingredient for hurricane formation.
But," Steig said, "the statistics [show] that such events are
more likely now than they used to be and will become more
likely in the future."
Some scientists, however, believe that we are in the
high-intensity stage of a decades-long natural hurricance
cycle, which they say is primarily responsible for any uptick
in storm activity.
Still others aren't even sure hurricanes are gaining strength.
Claim: Heat waves will be more frequent and more intense as temperatures rise.
"There's no question about this," the University of Washington's Steig said. "If the average is going up, the extremes have to go up as well."
2005 was the hottest year on Earth since the late 19th century, when scientists began collecting temperature data. The past decade featured five of the warmest years ever recorded, with the second hottest year being 1998.
Claim: Deaths from global warming will double in just 25 years to 300,000 people a year.
"The exact numbers are, at best, an extrapolation from [a heat wave that] was experienced in Europe in 2003," Steig said.
"However, there is no question that that heat wave was a major event and statistically very unlikely to have happened unless the statistics are changing.
"Since it did happen, the statistics are changing—that is, the globe really is warming up."
Claim: More than a million species worldwide could be driven to extinction in just half a century as a result of global warming.
Steig is "skeptical that climate change itself will cause this [extinction] … so much as direct human impacts such as land-clearing." But he noted that he hadn't read the latest studies, some of which do make such a claim.
For example, a study published in Nature in 2004 predicted that climate change could drive more than a million species towards extinction by 2050.
"Climate change now represents at least as great a threat to the number of species surviving on Earth as habitat destruction and modification," said the lead author of that study, Chris Thomas, a conservation biologist at the University of Leeds in the United Kingdom.
Claim: Global warming will also cause the introduction of new, invasive species.
"I take issue with the invasive-species linkage, because the human influence—directly, by transporting species around—I suspect is much more important than climate change," Steig said.
Claim: Global sea levels could rise by more than 20 feet (6 meters) with the loss of shelf ice in Greenland and Antarctica, devastating coastal areas worldwide.
There is little doubt that sea levels would rise by that much if Greenland melted.
But scientists disagree on when it could happen.
A recent Nature study suggested that Greenland's ice sheet will begin to melt if the temperature there rises by 3ºC (5.4ºF) within the next hundred years, which is quite possible, according to leading temperature-change estimates.
"It's uncertain how much warmer Greenland would get, [given] a certain carbon dioxide level, because different climate models give different amounts of warming," said Jonathan Overpeck, director of the Institute for the Study of Planet Earth at the University of Arizona in Tucson.
But many experts agree that even a partial melting would cause a one meter (three foot) rise in sea levels, which would entirely submerge low-lying island countries, such as the Indian Ocean's Maldives.
Some climate models are more conservative, suggesting that there will be no summer ice in the Arctic by the year 2100.
But new research shows it could take as little as 20 years for the sea ice to disappear.
"Since the advent of remote satellite imaging, we've lost about 20 percent of sea-ice cover," said Mark Serreze, a research scientist at the National Snow and Ice Data Center in Boulder, Colorado.
"We're setting ourselves up for very big losses this year."
"We think of the Arctic as the heat sink to the climate system," Serreze said.
"We're fundamentally changing this heat sink, and we don't know how the rest of the climate system is going to respond."
There is no doubt that as sea ice continues to melt, habitat for animals like polar bears will continue to shrink.
What are other countries doing about this?
"With the possible exception of Tiger Woods, nothing has had a worse year than global warming. We have discovered that a good portion of the science used to justify "climate change" was a hoax perpetrated by leftist ideologues with an agenda.“
— Todd Young, new congressperson from Indiana