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What is an ensemble of climate projections?

"Ensembles" are collections of output from multiple climate model simulations.  Typically an ensemble consists of output from several climate models, some of which include more than one simulation per model.  The IPCC recommends using ensembles to achieve higher quality and more quantitative information about future climate compared to a single model run.  Statistics of the ensemble (i.e., mean or standard deviation of all simulations) can provide a quantitative measure of part of the uncertainty associate with future projections - something that cannot be deduced from an individual model run. 

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Ensembles
Climate Projections