4. Appointment of Chairperson, Members and Member-Secretary.---(1) The full-time Chairperson and full-time Members, other than ex officio Members, of the Commission shall be appointed by the Central Government:
    Provided that every appointment under this sub-section shall, subject to the provisions of second proviso, be made on the recommendations of a Selection Committee consisting of---
        (a) Minister in-charge of the Ministry of Environment, Forest and Climate Change in the Government of India--Chairperson;
        (b) Minister in-charge of the Ministry of Commerce and Industry in the Government of India-- member;
        (c) Minister in-charge of the Ministry of Road Transport and Highways in the Government of India- -member;
        (d) Minister in-charge of the Ministry of Science and Technology in the Government of India-- member;
        (e) Cabinet Secretary--member:
    Provided further that in case where the Central Government appoints a serving officer as the Chairperson under clause (a) of sub-section (2) of section 3, or the full-time Member under clause (d) thereof, then, no recommendation of the Selection Committee shall be required.
    (2) No appointment of the Chairperson or a Member shall be invalid merely by reason of any vacancy of any member in the Selection Committee referred to in sub-section (1).
    (3) The appointment of the Member-Secretary of the Commission shall be made by the Central Government in such manner, subject to such terms and conditions, as may be prescribed.