Energy & Green Tech

How much energy do we really need?

Two fundamental goals of humanity are to eradicate poverty and reduce climate change, and it is critical that the world knows whether achieving these goals will involve trade-offs. New IIASA research for the first time provides ...

Internet

Twitter's political ad ban will exempt some 'issue' ads

Twitter Inc. is making some exceptions to its recent ban on all political advertising, announcing Friday that it will allow "cause-based" ads for some economic, environmental or social issues.

Climate change

Climate change is any long-term change in the statistics of weather over periods of time that range from decades to millions of years. It can express itself as a change in the mean weather conditions, the probability of extreme conditions, or in any other part of the statistical distribution of weather. Climate change may occur in a specific region, or across the whole Earth.

In recent usage, especially in the context of environmental policy, climate change usually refers to changes in modern climate (see global warming). For information on temperature measurements over various periods, and the data sources available, see temperature record. For attribution of climate change over the past century, see attribution of recent climate change.

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