Weather is to climate as a page is to a book. A few days of weather do not give the entire story of climate, just as a single page does not tell the entire story from a book.
Global warming is indeed a reality of our times, and so is consequent climate change. Yet, direct correlation between warming and many aspects of climate change remain disputed. But a current 430 ppm of carbon dioxide in the atmosphere, from the normal of 300 ppm, is reason enough for sustaining several undesirable and unbearable physical and biological changes - predominant being the disappearing islands, thawing permafrost and melting icecaps. A predicted 3-degree rise in temperature by the turn of the current century will make life unbearable.
Upheaval in global temperature has an intriguing history. Some 56 million years ago ambient global temperature had risen by 4 to 6 degrees over an extended period of some thousand years. Even ice core records of the past show that global warming was independent of the atmospheric carbon dioxide, which never exceeded 300 ppm. Climate change skeptics may have reason to rejoice. But global warming had an evolutionary purpose - it triggered mass extinction. What was destructive than, had elements of creativity later. It has kept the evolutionary process alive.
There is no single metric that explains climate change. At the global level it is understood as extreme events. However, at the local level the dynamism of seasonal change is conveniently referred to as climate variability - the term commonly used to describe the changes that allows us to make sense of our environment. This term is inadequately understood and frequently misused which leads to the incorrect interpretation of data on weather and climate resulting in inaccurate conclusions and misleading claims.
Weather is to climate as a page is to a book. A few days of weather do not give the entire story of climate, just as a single page does not tell the entire story from a book. A daily weather report (for a place may read like: 'The high today was 42°C, the low was 32°C, with a thunderstorm in the afternoon.' Such weather variability of a place is considered normal. But climatologists use 30-year climate normals to describe the climate of a location as well as the type, intensity, and frequency of extreme events.
Climate variability is conveniently used to explain any change in weather, because there are many who believe natural processes alone produce changes in climate. Little is realized that humans can also influence climate, because humans constantly interact with important parts of the climate system. In addition, scientists find that recent climate change cannot be explained by natural controls. It is therefore recommended those who wish to make valid assertions of climate change should first seek to understand the critical distinction climate change and climate variability.



