Document:

NitroCast Prototype Development

                                Statement of Work

                                   Prepared By
                       [GRAPHIC OMITTED][GRAPHIC OMITTED]
                                  July 24, 2000

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                          Statement of Confidentiality
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     This  document  contains  trade  secrets  and  information  that is company
sensitive,  proprietary, and confidential, the disclosure of which would provide
a  competitive  advantage to others.  As a result,  this  document  shall not be
disclosed,  used or duplicated,  in whole or in part, for any purpose other than
to evaluate Nivis.

     If a contract is awarded to Nivis,  as a result of, or in  connection  with
the  submission of this document,  any right to duplicate,  use, or disclose the
data will be to the extent provided in the resulting agreement. This restriction
does not limit the rights of the recipient to use  information  contained in the
data if it is rightfully obtained from another source without restriction.

           Copyright (c) 2000 Nivis [Unpublished]. All rights reserved.

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Table of Contents

Nivis contacts:...............................................................2

1.       Scope of Work........................................................3

2.       Proposed Approach....................................................4

3.       Deliverables.........................................................5

   o     Project kick-off, planning and agreement on milestone dates..........5
   o     Project Management...................................................5
   o     BluePrint............................................................5
   o     Prototype Handover...................................................5

4.       Nivis Assumptions....................................................5

5.       Staffing.............................................................6

6.     Responsibilities of Both Parties.......................................6

       Nivis Responsibilities.................................................6
       Greenleaf Responsibilities.............................................6

7     Estimated Project Schedule..............................................7

8     Fees....................................................................7

9     Statement of Work Agreement.............................................7

                                       23
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Nivis contacts:

Nivis LLC
2859 Paces Ferry Road
Suite 1600
Atlanta, Georgia 30339
770.863.9888
www.nivis.com

Marius Chilom
CEO
marius.chilom@nivis.com
404.386.4164

Pat Sullivan
Director - Business Development
Pat.Sullivan@nivis.com.....
404.229.3539

                                        24
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     The parties to this  Statement of Work (SOW) are Nivis,  LLC  ("Nivis") and
Greenleaf Technologies Corporation ("Greenleaf"). This Statement of Work defines
the scope of services to be performed by Nivis for  Greenleaf in its  production
of its "NitroCast" broadband  entertainment device prototype generally described
under Section 1, Scope of Work below. The statement includes a definition of the
scope of  work,  an  overview  of the  proposed  approach,  deliverables,  Nivis
assumptions,  staffing,  responsibilities  of both parties,  a firm,  definitive
project schedule and professional fees and expenses.

1.       Scope of Work

     Nivis shall develop an initial product prototype that meets  specifications
set forth by  GreenLeaf  Technologies.  The  research  and  development  Phase I
described in this Statement of Work will result in a product, which will operate
on  either  a  Windows  9x/NT  hybrid  or  Linux   platform.   The  new  box  or
better-described  "component"  will become the central  repository  and delivery
mechanism  for video and audio based  entertainment  in the home.  The component
will have the capability to store, download,  stream and play the latest movies,
deliver  television  programming,  serve up video  games and play  music off the
Internet  and  users  will be able to surf the net on  their  TV's.  Nivis  will
deliver to GreenLeaf a prototype  device that can be used for  demonstration  of
the above capabilities.

     Greenleaf shall provide onsite  oversight of the proposed project and Nivis
and its  employees  shall  cooperate  with the Greenleaf  project  director in a
reasonable fashion. Nivis shall provide Workspace at Nivis' Atlanta facility for
the  Greenleaf  project  director  to manage  these  activities  and to  provide
Greenleaf  staff with  knowledge  transfer  opportunities.  Nivis  will  provide
information to the Greenleaf project director throughout product development and
via the final  deliverables.  Nivis'  obligations  per this paragraph  assume in
depth technical knowledge on the part of the Greenleaf project director.

2.       Proposed Approach

     Nivis  proposes  an approach  that takes into  account  the  knowledge  and
expertise of both Greenleaf and Nivis personnel. We propose to meet at the Nivis
during the first week of the project to fully document a working  blueprint that
includes processes and desired outcomes of this research and development effort.
Attachment A is a Visio  document that shows a graphical  representation  of the
process.  Attachment B defines each step of the process from Attachment A. Below
is a high-level project plan and timeline.

[OBJECT OMITTED]

                                       25
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3.       Deliverables

o        Project kick-off, planning and agreement on milestone dates

     Consists of project introduction, establishment of milestones and milestone
dates,  development  of  project  plan  and  agree on the  Change  Request/Scope
process. All customization and/or interfaces that exceed these stated thresholds
would be considered out of scope of this SOW.

o        Project Management

     Weekly Written Status Reports will be developed and  maintained.  The Nivis
project  manager  will handle all Change  Request/Scope  Change  items and their
resolution.

o        BluePrint

     At the  end  of  week 1 a  comprehensive  document  will  be  delivered  to
GreenLeaf   for  signature   that  will  include  a  technical  and   functional
specification  from which to continue the project.  The  blueprint  will contain
references to  technology  to be utilized,  processes to be followed and metrics
for  success of each step of that  process.  Signature  by both  parties on this
document will allow the project to advance to detailed development and testing.

o        Prototype Handover

     Nivis shall deliver the NitroCast device, and accompanying product software
and documentation to Greenleaf upon receipt of final payment. The prototype will
meet specifications mutually agreed upon in the blueprint.

o        Product Documentation

     Upon delivery of the Product,  Nivis shall provide  Greenleaf with complete
documentation  necessary for Greenleaf to operate and demonstrate the prototype.
Product  documentation  shall be  provided in both  written  and  digital  form.
Greenleaf  project  management will coordinate with Nivis project  management to
mutually agree in writing to documentation  deliverables within the first 5 days
of the project.

     Nivis will provide all deliverables  detailed in this Statement of Work and
according to the mutually  agreed upon Project  Plan.  Any  additional  work not
included in this document must be described in a Nivis Change Request. Greenleaf
agrees to  respond to a change  request  within 24 hours of  receipt.  Greenleaf
agrees to use this format when requesting any changes to this Statement of Work.
Nivis and Greenleaf must authorize all change activity before work begins.

                                       26
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4.       Nivis Assumptions

     Nivis' fees, work plans, and deliverables are contingent upon the following
assumptions:

1.   Access  to  required  Greenleaf  management  and staff  will be  reasonably
     available to the Nivis project team during this engagement.

2.   Greenleaf  will provide a full time (75%)  project  representative  to work
     with the Nivis team during the creation of the system blueprint.

3.   Greenleaf will provide timely signature approval to milestone  deliverables
     upon their execution and acceptance as evidence of progress.  If signoff is
     not received within 24 hours and the acting Greenleaf  Project Director has
     not notified Nivis that the deliverable is unacceptable,  the document will
     be considered accepted.  The delivery of the signoff document to the acting
     Greenleaf  Project  Director  will  trigger  the  Nivis  invoice  for  such
     milestone deliverable.

4.   All hardware/software not currently in the possession of Nivis but which is
     required to either fulfill  specific  project  objectives or to produce the
     NitroCast   prototype   will  be  provided   and  paid  for  by   Greenleaf
     technologies. We currently estimate $45,000 in expense for these items. See
     Attachment C for details behind our estimate.  All items requiring purchase
     must be  documented  and agreed to in  writing by both Nivis and  Greenleaf
     prior to the items purchase.

                                       27
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5.       Staffing

     Nivis  will  dedicate  a  Project  Manager  and a team of  application  and
technical   consultants  to  this  engagement  effort.  These  consultants  will
primarily work out of the Atlanta Nivis office.

     Greenleaf  personnel  will be assigned to the Project team as determined by
the  final  project  plan.  It  is  estimated  that   functional  and  technical
support/management  personnel  will be  required  occasionally  to assist in the
delivery of Greenleaf assigned tasks (i.e.  validation,  process flow,  industry
questions,  etc). A dedicated  project director will work closely with the Nivis
project manager to assure timely completion of assigned tasks and deliverable.

6.        Responsibilities of Both Parties

     The  spirit  of this  engagement  is one  based  on  mutual  advantage  and
partnership.   In  keeping  with  this,  the  following  outlines  each  party's
responsibilities in making this project a success.

Nivis Responsibilities

     Nivis will provide a Project  Manager to coordinate  all  activities of the
engagement  team and to serve as the primary point of contact with the Greenleaf
management   team.   This  will   include   preparation   of  a   comprehensive,
milestone-based  and  driven  project  plan that  identifies,  for each  project
milestone activity, the scheduled time frame and resources required.  Nivis also
will  provide a weekly  status  report  that  describes  the  status of  project
activities   against  the  plan  and  is  responsible  for  all   organizational
communications and user acceptance planning.

Project Management Deliverables include:
o    Detailed,  Milestone-based  Workplan - after mutual agreement is reached on
     the engagement scope and content.
o    Status Reports - weekly
o    Executive Briefings - every two weeks

Greenleaf Responsibilities

     Greenleaf will designate a dedicated  Project Director with  responsibility
and authority for review and approval of deliverables under this agreement.

     In order to  accomplish  the tasks  outlined in this  Statement of Work and
provide the deliverables in accordance with the rapid  implementation  approach,
Nivis will require  strict  compliance  from Greenleaf by the dates agreed to in
the  project  plan.  If  Greenleaf  does not  provide  any of these items by the
required date specified (subject to the terms outlined in Nivis Assumptions item
three), delivery dates and incremental costs to Greenleaf for Nivis deliverables
will be revised  accordingly,  subject to the terms  outlined  in  "Professional
Arrangements" paragraph three (3) and according to the Professional Services Fee
Schedule contained herein.

     Nivis will not be held  responsible  for delays in the timetable due to the
unavailability of data or resources from Greenleaf.

                                       28
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7        Estimated Project Schedule

     NIVIS  shall  commence  the work  described  herein  on July  31,  2000 and
estimates  delivery all deliverables to Greenleaf on or before October 16, 2000.
The estimated schedule is described in detail in section 2 above.

8        Fees

     Nivis shall  perform all work  pursuant to this  Agreement for an estimated
time and materials fee of $670,000. Fees are subject to the following:

     Payment  will  be due  as  follows:  $100,000  due  upon  signing  of  this
agreement. The balance will be paid as follows:

o    $100,000 due on completion and signoff of initial blueprint (001 on project
     plan)
o    $275,000  due upon  completion  of Windows and Linux  Software  development
     (Step 006 on project plan)
o    Remaining  amount  (estimated to be $195,000) due upon  completion  (015 on
     project plan) on October 6, 2000. Any variance above or below the estimated
     cost will be settled on this final payment.
o    Greenleaf  and Nivis will  execute a standard  Consulting  Agreement  on or
     before  August 15, 2000 that will  include  language  outlining  Nivis as a
     "work for hire" developer for Greenleaf.

1.   Any  change  in the  scope  of work or due  date of a  milestone,  requires
     written  approval by Greenleaf and Nivis prior to proceeding and is subject
     to the change request process defined herein.
2.   Out of scope  work will be billed at the  blended  rate of  $125/hr.  Nivis
     shall  perform no out of scope  work  without  prior  written  approval  of
     Greenleaf and Nivis.
3.   Reasonable out of pocket expenses for items directly related to the project
     including but not limited to equipment,  travel, meals, supplies etc., will
     be paid by Greenleaf.  Any purchase over $500 will require written approval
     from the Greenleaf Project Director prior to purchase.  Nivis will supply a
     list of  hardware  required  for  purchase  at least 1 week in advance  for
     signature approval. Nivis will invoice Greenleaf weekly for such expenses.

9        Statement of Work Agreement

     By signing  this  document,  Greenleaf  and Nivis agree to the terms of the
Statement of Work. Greenleaf may terminate this agreement with or without cause,
with a 20 day written  notice.  If this  Agreement is terminated  without cause,
Greenleaf  agrees to  compensate  Nivis for all services  rendered  towards this
Project  on a pro  rata  basis  based  on work  completed  through  the  Project
cancellation  date. If this  Agreement is terminated  for cause,  Nivis shall be
compensated  only  for  delivered  work of  actual  value  to  Greenleaf  in its
subsequent pursuit of the Project.

                        Signatures on the following page

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Accepted and Agreed To:

Client:  Greenleaf Technologies Corp.                Nivis

By:/s/Gerald Warnero                                 By:/s/Marius Chilom

Name: Gerald Warnero                                 Name:    Marius Chilom

Title:  CEO                                          Title:     CEO

                                       30EXHIBIT 4.1

                                    AMENDMENT
                                     TO THE
                            COMFORT SYSTEMS USA, INC.
                        1998 EMPLOYEE STOCK PURCHASE PLAN

      This Amendment to the Comfort Systems USA, Inc. (the "Company") 1998
Employee Stock Purchase Plan (the "Amendment") is executed pursuant to Section
8.1 of the Company's 1998 Employee Stock Purchase Plan (the "Plan"). All
capitalized and undefined terms used herein shall have the meanings ascribed to
such terms in the Plan.

      WHEREAS, the Company's Board of Directors (the "Board") is authorized by
Section 8.1 of the Plan to amend the Plan from time to time, subject to any
required stockholder approval of any such amendments; and

      WHEREAS, at a meeting of the Board on March 3, 2000 the Board authorized
an increase in the number of shares authorized for issuance under the Purchase
Plan by 600,000; and

      WHEREAS, at the annual meeting of stockholders held on May 18, 2000, the
Company's stockholders approved the Amendment.

      NOW, THEREFORE, in order to amend Section 4.1 of the Purchase Plan as
authorized by the Board and approved by the stockholders:

      1. The first sentence of Section 4.1 of the Purchase Plan is hereby
revised in its entirety to read as follows:

            "Subjects to the adjustments in Sections 4.2 and 4.3, an aggregate
            of Nine Hundred Thousand (900,000) shares of Common Stock shall be
            available for purchase by Participants pursuant to the provisions of
            the Plan."

      2. Except as amended hereby, the terms and provisions of the Plan shall
remain in full force and effect, and the Plan and this Amendment shall be read,
taken and construed as one and the same instrument.

            IN WITNESS WHEREOF, and as conclusive evidence of the adoption of
the foregoing Amendment to the Plan by the directors of the Company and approval
and adoption thereof by the stockholders of the Company, the Company has caused
this Amendment to be duly executed in its name and behalf by its proper officers
thereunto duly authorized as of the 20th day of May, 2000.

                                    COMFORT SYSTEMS USA, INC.

                                    By:/S/ WILLIAM GEORGE
                                           William George
                                           Senior Vice President

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