EXHIBIT 23.3 CONSENT OF PRICEWATERHOUSECOOPERS LLP We hereby consent to the use in this registration statement on Form SB-2 of our report dated February 28, 2002, relating to the financial statements of Environmental Safeguards, Inc. which appears in such registration statement. We also consent to the reference to our firm under the caption "Experts in such registration statement". - ----------------------------------- /s/ PricewaterhouseCoopers LLP Houston, Texas September 10, 2003