Extension of time limits: Government may notify extensions for actions impeded by force majeure, including retrospective effect. Section 168A authorizes the Government, on Council recommendation, to notify extensions of time limits under the Act where actions cannot be completed due to force majeure, and to give such notifications retrospective effect from a date not earlier than the Act's commencement; force majeure includes war, epidemic, flood, drought, fire, cyclone, earthquake or other calamities affecting implementation.