3.27. Global warming

“Global warming” has been introduced by the scientific community and the media as the term that encompasses all potential changes in climate that result from higher average global temperatures. Hundreds of scientists from many different countries are working to understand global warming and have come to a consensus on several important aspects. In general, Global warming will produce far more profound climatic changes than simply a rise in global temperature.

An analysis of temperature records shows that the Earth has warmed an average of 0.5°C over the past 100 years. This is consistent with predictions of global warming due to an enhanced greenhouse effect and increased aerosols. Part of the current global warmth is associated with the tropical El Nino, without which a record global temperature would probably not have occurred.

The Earth's climate is the result of extremely complex interactions among the atmosphere, the oceans, the land masses, and living organisms, which are all warmed daily by the sun's energy. This heat would radiate back into space if not for the atmosphere, which relies on a delicate balance of heat-trapping gases - including water vapor, carbon dioxide, nitrous oxide, and methane - to act as a natural "greenhouse," keeping in just the right amount of the sun's energy to support life.

For the past 150 years, though, the atmospheric concentrations of these gases, particularly carbon dioxide, have been rising. As a result, more heat is being trapped than previously, which in turn is causing the global temperature to rise. Climate scientists have linked the increased levels of heat-trapping gases in the atmosphere to human activities, in particular the burning of fossil fuels (coal, oil, and natural gas for heating and electricity; gasoline for transportation), deforestation, cattle ranching, and rice farming.

As the Earth's climate is the result of extremely complex interactions, scientists still cannot predict the exact impact on the earth's climate of these rising levels of heat-trapping gases over the next century. The current best estimate is that if carbon dioxide concentrations double over preindustrial levels, according to the scientific possible scenarios, an atmospheric doubling of carbon dioxide could occur as early as 2050.

In 1995, scientists with the Intergovernmental Panel on Climate Change - the authoritative international body charged with studying this issue-reached a conclusion in the Second Assessment Report, which summarizes the current state of scientific knowledge on global warming, also called climate change.

For the first time ever, the Panel concluded that the observed increase in global average temperature over the last century "is unlikely to be entirely natural in origin" and that "the balance of evidence suggests that there is a discernible human influence on global climate."

3.28. Agatha christie

Agatha Christie is known all over the world as the Queen of Crime. She wrote 78 crime novels, 19 plays and 6 romantic novels under the name of Mary Westmacott. Her books have been translated into 103 foreign languages. She is the third best-selling author in the world (after Shakespeare and the Bible). Many of her novels and short stories have been filmed. The Mousetrap, her most famous play, is now the longest-running play in history. Agatha Christie was born at Torquay, Devonshire. She was educated at home and took singing lessons in Paris. She began writing at the end of the First World War. Her, first novel, The Mysterious Affair at Styles, was published in 1920. That was the first appearance of Hercule Poirot, who became one of the most popular private detectives since Sherlock Holmes. This little Belgian with the egg-shaped head and the passion for order amazes everyone by his powerful intellect and is brilliant solutions to the most complicated crimes. Agatha Christie became generally recognised in 1926, after the publishing of her novel The Murder of Roger Ackroyd. It's still considered her masterpiece. When Agatha Cristie got tired of Hercule Poirot she invented Miss Marple, a deceptively mild old lady with her own method of investigation. Her last Poirot book, Curtain, appeared shortly before her death, and her last Miss Marple story, Sleeping Murder, and her autobiography were published after her death. Agatha Christie's success with millions of readers lies in her ability to combine clever plots with excellent character drawing, and a keen sense of humour with great powers of observation. Her plots always mislead the reader and keep him in suspense. He cannot guess who the criminal is. Fortunately, evil is always conquered in her novels. Agatha Christie's language is simple and good and it's pleasant to read her books in the original.