43It follows from Annex III, No 1, that the characteristics of a project must be assessed, inter alia, in relation to its cumulative effects with other projects. Failure to take account of the cumulative effect of one project with other projects must not mean in practice that they all escape the obligation to carry out an assessment when, taken together, they are likely to have significant effects on the environment (see, to that effect, judgment in Brussels Hoofdstedelijk Gewest and Others, EU:C:2011:154, paragraph 36).
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