Exhibit (4)(f)

                 SECOND AMENDMENT TO STOCK SUBSCRIPTION WARRANT


     THIS  SECOND  AMENDMENT  TO  STOCK   SUBSCRIPTION   WARRANT  (this  "Second
Amendment")  dated as of June 15,  2000 by and  between  Startech  Environmental
Corporation  (the  "Company")  and the  Connecticut  Development  Authority (the
"Authority").

                                   WITNESSETH:

     WHEREAS,   the  Company   issued  to  the  Authority   that  certain  Stock
Subscription Warrant dated December 29, 1998 to purchase shares of the Company's
Common Stock (the "Original Warrant") which Original Warrant was issued pursuant
to that  certain  Loan  Agreement  dated  December  29,  1998 by and between the
Company and the Authority;

     WHEREAS,  the Company and the Authority  entered into an Amendment to Stock
Subscription Warrant dated as of March 31, 1999 (the "First Amendment") to amend
certain terms of the Original Warrant (The Original  Warrant,  as amended by the
First Amendment, is hereinafter referred to as the "Warrant");

     WHEREAS,  the Company and the Authority wish to amend the Warrant to extend
the expiration date thereof and to modify certain other provisions thereof;

     NOW THEREFORE,  each of the parties hereto,  in consideration of the mutual
covenants set forth herein, agrees as follows:

     1. (a) The  definition  of "Term of this Warrant" set forth in Section 1 of
the Warrant is modified to read as follows:

          "Term of this Warrant - shall mean the period beginning on the date of
          initial issuance hereof and ending on December 31, 2001."

     (b) The following definition is hereby added to Section 1 of the Warrant:

          "Realized Loss - means as of any date the amount, if any, by which (i)
          the  aggregate  amount that the Holder would have received if the sale
          price of all Warrant  Shares  publicly sold by the Holder  through and
          including such date had been the Warrant  Price,  exceeds (ii) the sum
          of (A) the aggregate amount that the Holder actually received from the
          public sale of Warrant  Shares through and including such date and (B)
          the  amounts,  if any,  previously  paid by the  Company to the Holder
          pursuant to Section 2.5 of the Warrant (and not  previously  repaid to
          the Company by the Holder thereunder)."

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     2.  Subsection  2.1 of the  Warrant  is  deleted  in its  entirety  and the
following shall be inserted in lieu thereof:

                  2.1 Right to Exercise.  During the Term of this  Warrant,  the
         Holder may exercise  this Warrant in whole at any time, or in part from
         time to time,  for up to an aggregate of 433,268 Shares of Common Stock
         (subject to adjustment as provided in Section 9.1 of the Warrant).  Any
         such partial  exercise shall be for a minimum of 1,000 Shares of Common
         Stock.

     3.  Subsection  2.2 of the  Warrant  is  deleted  in its  entirety  and the
following shall be inserted in lieu thereof:

                  2.2  Procedure  for  Exercise  of Warrant.  To  exercise  this
         Warrant,  the  Holder  shall  deliver to the  Company at its  principal
         office  referred to in Section 11 hereof at any time during the Term of
         this Warrant:  (i) the Notice of Exercise in the form attached  hereto,
         (ii) cash, certified or official bank check payable to the order of the
         Company,  wire transfer of funds to the Company's account,  or evidence
         of any  indebtedness  of the Company to the Holder ( or any combination
         of any of the  foregoing)  in the amount of the Warrant  Price for each
         share then being purchased, and (iii) this Warrant.

                  In the event of any exercise of the rights represented by this
         Warrant,  a certificate or certificates  for the shares of Common Stock
         so  purchased,  registered in the name of the Holder or such other name
         or names as may be designated by the Holder,  shall be delivered to the
         Holder hereof  within a reasonable  time,  not  exceeding  fifteen (15)
         days,  after the rights  represented by this Warrant shall have been so
         exercised;  and,  unless  this  Warrant  has  expired,  a  new  Warrant
         representing  the  number of  shares  (except  a  remaining  fractional
         share),  if any, with respect to which this Warrant shall not then have
         been  exercised  shall also be issued to the Holder  hereof within such
         time.  The  person in whose name any  certificate  for shares of Common
         Stock is issued upon  exercise of the Warrant shall for all purposes be
         deemed to have  become the holder of record of such  shares on the date
         on which the Warrant was  surrendered  and payment of the Warrant Price
         and any applicable taxes was made, irrespective of the date of delivery
         of such  certificate,  except that,  if the date of such  surrender and
         payment  is a date when the stock  transfer  books of the  Company  are
         closed,  such person  shall be deemed to have become the holder of such
         shares at the close of  business on the next  succeeding  date on which
         the stock transfer books are open.

     4. Section 2 of the Warrant shall be amended by adding the following as new
subsections 2.4 and 2.5:

                  2.4 Sale of Warrant Shares.  The Holder agrees that the Holder
         will not sell, during any five business day period, a number of Warrant
         Shares  representing  greater  than 7% of the average  weekly  reported
         trading  volume of the  Common  Stock  during the four  calendar  weeks
         preceding the date of sale by the Holder (or such greater percentage as

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         the parties may agree upon).  The foregoing  provision  will  terminate
         upon  the  earlier  of (i) July 1,  2002  and  (ii)  the date  that any
         director or officer  named in the Company's  Registration  Statement on
         Form S-1,  Registration No. 333-35786,  sells, during any five business
         day period,  shares of Common Stock representing greater than 7% of the
         average weekly  reported  trading volume of the Common Stock during the
         four  calendar  weeks  preceding the date of such sale (or such greater
         percentage  as the parties had  previously  agreed upon with respect to
         the most recent sale by the Holder).  While the resale limitation under
         this subsection 2.4 remains in effect, the Company shall provide to the
         Holder,  promptly upon receipt by the Company, a copy of each statement
         on Form 4 or  Form 5 of  changes  in the  beneficial  ownership  of the
         Common Stock filed by any such officer or director  pursuant to Section
         16 of the Exchange Act.

                  2.5  Investment  Protection.  If,  at any  time  prior  to and
         including July 1, 2002, the Holder publicly sells any Warrant Shares at
         a price per share  less  than the  Warrant  Price,  the  Company  shall
         promptly  pay to the Holder an amount  equal to the  Holder's  Realized
         Loss. The Company may pay such amount to the Holder in cash,  certified
         or  official  bank check  payable to the order of the Holder or, in the
         discretion  of the  Company,  in shares of Common  Stock  valued at the
         Current  Market Price at the time of payment or in any  combination  of
         cash and such  shares.  If the Company has paid an amount to the Holder
         on account of a Realized  Loss and the Holder later (but not later than
         July 1, 2002) publicly sells  additional  Warrant Shares at a price per
         share greater than the Warrant  Price,  the Holder shall promptly repay
         to the Company an amount equal to the lesser of (i) the amount by which
         the aggregate  amount received by the Holder from such sale exceeds the
         amount the  Holder  would have  received  had the sales  price for such
         Warrant Shares been the Warrant Price, and (ii) the total Realized Loss
         previously paid by the Company to the Holder (and not previously repaid
         by operation of this sentence). The Holder may repay such amount to the
         Company in cash or by check  payable to the order of the Company or, in
         the  discretion of the Holder,  in shares of Common Stock valued at the
         Current Market Price at the time of repayment or in any  combination of
         cash and such shares.

     5. Except as provided in this Second Amendment, the terms and conditions of
the Warrant are hereby ratified and confirmed,  and the date of initial issuance
thereof shall be deemed to remain as December 29, 1998.

     6. This Second  Amendment  may be executed in  counterparts,  each of which
when so  executed  and  delivered  shall  constitute  a  complete  and  original
instrument  but  all of  which  together  shall  constitute  one  and  the  same
agreement,  and it shall  not be  necessary  when  making  proof of this  Second
Amendment or any counterpart thereof to account for any other counterpart.

     7. This Second  Amendment  shall be governed by, and construed and enforced
in accordance with, the laws of the State of Connecticut.

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     IN WITNESS WHEREOF, the parties hereto have caused this Second Amendment to
be duly executed on their behalf as of the day and year first written above.

                                STARTECH ENVIRONMENTAL CORPORATON


                                By:
                                    --------------------------------------------
                                    Joseph F. Longo
                                    Title:  President and Chief
                                            Executive Officer



                                CONNECTICUT DEVELOPMENT AUTHORITY


                                By:
                                    --------------------------------------------
                                    Francis T. Gagliardo
                                    Title:   Senior Vice President


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