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Thursday, 13 March 2008
1. What causes the change in climate? The Earth’s climate changes in response to external forcing, including variations in its orbit around the Sun. The detailed causes of the recent warming remain an active field of research, but the scientific consensus is that the increase in atmospheric greenhouse gases due to human activity caused most of the warming observed since the start of the industrial era. This attribution is clearest for the most recent 50 years, for which the most detailed data are available. Some other hypotheses departing from the consensus view have been suggested to explain the temperature increase. One such hypothesis proposes that warming may be the result of variations in solar activity. None of the effects of forcing are instantaneous. The thermal inertia of the Earth’s oceans and slow responses of other indirect effects mean that the Earth’s current climate is not in equilibrium with the forcing imposed. Climate commitment studies indicate that even if greenhouse gases were stabilized at 2000 levels, a further warming of about 0.5°C (0.9 °F) would still occur.
2. What is Global Warming? Global Warming is the increase in average temperature of the Earth’s near-surface air and oceans in recent decades and its projected continuation.
3. What are the consequences of Global Warming? Increased temperature will cause sea level to rise, and is expected to increase the intensity of extreme weather events and to change the amount and pattern of precipitation. Other effects of global warming include changes in agricultural yields, trade routes, glacier retreat, species extinctions and increases in the range of disease vectors, species extinctions and increases in the ranges of disease vectors. Remaining scientific uncertainties include the amount of warming expected in the future, and how warming and related changes will vary from region to region around the globe. Most national governments have signed and ratified the Kyoto Protocol aimed at reducing greenhouse gas emissions, but there is ongoing political and public debate worldwide regarding what, if any, action should be taken to reduce or reverse future warming or to adapt to its expected consequences
*timeisrunningout
Climate change is sometimes used to refer to all forms of climatic inconsistency, but because the Earth's climate is never static, the term is more properly used to imply a significant change from one climatic condition to another. In some cases, climate change has been used synonymously with the term, global warming ; scientists however, tend to use the term in the wider sense to also include natural changes in climate.
From this topic, i learned that climate change can cause global warming and frequent volcanic eruptions. And that global warming is the increase in average temperature of the Earth’s near-surface air and oceans in recent decades and its projected continuation. And Global Warming increases temperature and will cause sea level to rise, and is expected to increase the intensity of extreme weather events and to change the amount and pattern of precipitation. Other effects of global warming include changes in agricultural yields, trade routes, glacier retreat, species extinctions and increases in the range of disease vectors, species extinctions and increases in the ranges of disease vectors.
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