Exhibit 31.2
CERTIFICATION PURSUANT TO SECTION 302 OF THE SARBANES-OXLEY ACT OF 2002
I, Robert G. Simpson, certify that:
1. I have reviewed this Amendment No. 1 to the annual report on Form 10-K/A of Waste Management, Inc.;
2. Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report.
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| | | By: | | /s/ROBERT G. SIMPSON |
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| | | | | Robert G. Simpson
Senior Vice President and Chief Financial Officer |
Date: February 22, 2011
