Forecasting weather can have its challenges, and meteorologists are generally limited to a maximum range of between 11 to 14 days for making accurate forecasts of future weather due to the complexity and chaos of the system. Predicting future climate can be even more difficult.
Instruments such as rain gauges and thermometers allow a high degree of accuracy in measuring current weather conditions. In looking at past climate using paleo proxies such as tree rings and ice cores there is some degree of uncertainty in terms of how accurate the natural recorder is of the actual conditions at the time. Likewise, in forecasting the future, there are unknowns and uncertainties that scientists frame in terms of probability. Yet, communicating probability without using numbers is not easy. A statement such as "a high likelihood of drought conditions" is often translated as "there will certainly be a drought" in the media.
One question that many people
are concerned with is whether or not global warming is occurring and
what the consequences will be. We know from current research that the
surface temperature of the Earth is warming, having risen by .6 degrees
Celsius over the past 100 years. (See Whitehouse
Press Release, June 2001). It is also known from ice core records
Vostok in Antarctica that carbon dioxide emissions, primarily from
the combustion of fossil fuels, are at the highest levels in over 400,000
Instrumental records, while increasingly detailed and comprehensive, are often limited to the past 100-150 years, and paleoclimate data enriches our understanding of climate change by providing a longer term perspective of what is "normal" or "average" in terms of climatic range and variability. Through the Climate TimeLine's Data Access it is possible to access instrumental data of your region of interest as well as examine paleoclimate reconstructions for an overview of recent centuries' climate variability. Also see A Paleo Perspective on Global Warming and Global Warming: Early Warning Signs from the Union of Concerned Scientists.
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