why do some scientists not believe in global warming

More than one-quarter of Americans are climate change skeptics, according to a new report released by the Public Religion Research Institute. These deniers don't believe that the planet Earth's climate is changing, even though. When asked why they don't believe, the skeptics' most common response was that they had not noticed a change in the weather around them, and that the. "I hunt a lot, and last winter I froze my butt off," wrote one respondent. Here is a chart from the report showing this and other reasons that skeptics gave for doubting climate change. The survey is based on telephone interviews conducted among a random sample of 3,022 adults living in the US (see the full report
). The second most common response was that temperatures are not rising because of human actions, instead they are just fluctuating as part of a larger natural cycle. "I think there are just trends where the temperature goes up and down as part of a natural cycle every couple of hundred years," said one respondent. In fact, there is. The chart below, published by the Intergovernmental Panel on Climate Change, includes a series of graphs, each presenting two models.

The purple stripes show the climate changes we'd expect from only natural events, like solar variations, and the pink stripes show the changes in a model that includes human actions, like burning fossil fuels. If human actions had no effect on climate, the purple and pink stripes would occupy the same space on each graph. Instead, they're different in almost every case, meaning human actions have a definite effect on climate change. Most tellingly, the black lines on each graph represent the changes we've observed in real life в not just in models в and they match up with the pink stripe in every case. The third most popular response, with 12% of deniers selecting it, is that there is not enough scientific evidence to back up the claim that the Earth is getting hotter. "I donвt see any real evidence of that in the news media," said one participant. "The entire scientific community really appears divided and scattered about the entire issue. " But in reality, the scientific community agrees. A small minority of skeptics (4%) responded that they have alternative theories about global warming. Around 2% said they believe God is in control and 5% believe that data and news reports showing global warming are propaganda.

Since became a major issue, climatology has become a hot-button scientific field. Weather stations throughout the world collect data to help scientists create computer models that help them track global climate change. Some people simply don't believe that the Earth is undergoing a global warming trend or climate change. Others believe in global warming and climate change, but don't believe that people are responsible. The skeptics who don't believe in global warming at all are the ones who most vehemently attack weather data, the analysis of the climatologists and the predictions of the models. Anti-global warming skeptics say the placement of some weather stations in urban areas may produce inaccurate measurements. According to them, the data are being corrupted by the urban heat island, an effect produced by cities' transportation, large amounts of heat-absorbing asphalt, and high concentrations of carbon dioxide coming from the many homes and businesses in high-population areas. Global warming skeptics also believe the models used to predict Earth's future under global warming are unreliable.

They feel that while the, clouds, gases, and oceans are responsible for weather, so, too, are other factors, including some we don't currently understand. According to global warming skeptics, computer models are merely a guess at what will happen on Earth in the future -- something climatologists don't deny -- and an arguably poor guess at that. After all, if we can't accurately predict the weather a week from now, how can we predict the global climate in 100 years? Others don't believe we're experiencing a global warming trend at all. The annual temperature between 1998 and 2007 actually decreased, despite the 4 percent increase in carbon dioxide in the atmosphere during that same period. They also point out that, while the Northern Hemisphere has warmed, the Southern Hemisphere has actually cooled. Global warming was supposed to actually be global, not hemispheric, says skeptic -- and Executive Director of the Natural Resources Stewardship Project -- Tom Harris [source: ]. These same skeptics find fault in the historical data used to graph things like glacial loss and hurricane frequency.

Although weather data, like temperature, have been actively collected since 1850, it wasn't until the relatively recent access to detailed weather satellite photography that scientists were able to see changes in the Greenland ice shelf that global warming believers say is in such danger. Skeptics ask: How can we know how long it's been receding? Perhaps the meteorological event most often used by global warming skeptics as a counterargument is the Medieval Warm Period. Around the 9th to 14th centuries, regions around the world experienced an increase in temperatures, similar to what we see today [source: ]. Following this period, the Earth experienced a Little Ice Age where global temperatures cooled. It is conceivable that the Earth is currently experiencing something similar to this, skeptics say. Their point is, we simply don't know enough about long-term weather systems to say for certain one way or the other. The skeptics of human-caused ( anthropogenic ) global warming don't dismiss global warming outright, they just don't believe that human activity is responsible. Learn more about their beliefs on the next page.

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