(a) the carrying out of the physical activity, including any physical activity that is incidental to that physical activity, has begun and, as a result, the environment has been altered;
(b) a federal authority has exercised a power or performed a duty or function conferred on it under any Act of Parliament, other than the Act, that could permit the physical activity to be carried out, in whole or in part;
(c) a jurisdiction described in any of paragraphs (c) to (f) of the definition jurisdiction in subsection 2(1) of the Act or the responsible authority set out in paragraph 15(a) or (b) of the Act has commenced or completed an assessment of the environmental effects of the physical activity; and
(d) the physical activity was a project, or was included in a project, for which the screening, commenced under the former Act before the day on which the Act came into force, was not subject to the requirement in subsection 124(1) of the Act to be continued and completed.