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        <PersonNm>Joseph J Mueller</PersonNm>
        <TitleTxt>Director</TitleTxt>
        <AverageHoursPerWeekRt>3.00</AverageHoursPerWeekRt>
        <IndividualTrusteeOrDirectorInd>X</IndividualTrusteeOrDirectorInd>
        <ReportableCompFromOrgAmt>0</ReportableCompFromOrgAmt>
        <ReportableCompFromRltdOrgAmt>0</ReportableCompFromRltdOrgAmt>
        <OtherCompensationAmt>0</OtherCompensationAmt>
      </Form990PartVIISectionAGrp>
      <Form990PartVIISectionAGrp>
        <PersonNm>Georgia Chafee Nassikas</PersonNm>
        <TitleTxt>Director</TitleTxt>
        <AverageHoursPerWeekRt>3.00</AverageHoursPerWeekRt>
        <IndividualTrusteeOrDirectorInd>X</IndividualTrusteeOrDirectorInd>
        <ReportableCompFromOrgAmt>0</ReportableCompFromOrgAmt>
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        <OtherCompensationAmt>0</OtherCompensationAmt>
      </Form990PartVIISectionAGrp>
      <Form990PartVIISectionAGrp>
        <PersonNm>Glenn T Prickett</PersonNm>
        <TitleTxt>Director</TitleTxt>
        <AverageHoursPerWeekRt>2.00</AverageHoursPerWeekRt>
        <IndividualTrusteeOrDirectorInd>X</IndividualTrusteeOrDirectorInd>
        <ReportableCompFromOrgAmt>0</ReportableCompFromOrgAmt>
        <ReportableCompFromRltdOrgAmt>0</ReportableCompFromRltdOrgAmt>
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      <Form990PartVIISectionAGrp>
        <PersonNm>Kilaparti Ramakriashna</PersonNm>
        <TitleTxt>Director</TitleTxt>
        <AverageHoursPerWeekRt>1.00</AverageHoursPerWeekRt>
        <IndividualTrusteeOrDirectorInd>X</IndividualTrusteeOrDirectorInd>
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        <OtherCompensationAmt>0</OtherCompensationAmt>
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      <Form990PartVIISectionAGrp>
        <PersonNm>Daniel A Reifsynder</PersonNm>
        <TitleTxt>Director</TitleTxt>
        <AverageHoursPerWeekRt>2.00</AverageHoursPerWeekRt>
        <IndividualTrusteeOrDirectorInd>X</IndividualTrusteeOrDirectorInd>
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        <OtherCompensationAmt>0</OtherCompensationAmt>
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      <Form990PartVIISectionAGrp>
        <PersonNm>Joseph R Robinson</PersonNm>
        <TitleTxt>Director</TitleTxt>
        <AverageHoursPerWeekRt>2.00</AverageHoursPerWeekRt>
        <IndividualTrusteeOrDirectorInd>X</IndividualTrusteeOrDirectorInd>
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      <Form990PartVIISectionAGrp>
        <PersonNm>Ihsan K Speede</PersonNm>
        <TitleTxt>Director</TitleTxt>
        <AverageHoursPerWeekRt>1.00</AverageHoursPerWeekRt>
        <IndividualTrusteeOrDirectorInd>X</IndividualTrusteeOrDirectorInd>
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      <Form990PartVIISectionAGrp>
        <PersonNm>Izabella M Teixeira</PersonNm>
        <TitleTxt>Director</TitleTxt>
        <AverageHoursPerWeekRt>1.00</AverageHoursPerWeekRt>
        <IndividualTrusteeOrDirectorInd>X</IndividualTrusteeOrDirectorInd>
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      <Form990PartVIISectionAGrp>
        <PersonNm>Stephanie N Tomasky</PersonNm>
        <TitleTxt>Director</TitleTxt>
        <AverageHoursPerWeekRt>1.00</AverageHoursPerWeekRt>
        <IndividualTrusteeOrDirectorInd>X</IndividualTrusteeOrDirectorInd>
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      <Form990PartVIISectionAGrp>
        <PersonNm>Cyrus N Wadia</PersonNm>
        <TitleTxt>Director</TitleTxt>
        <AverageHoursPerWeekRt>1.00</AverageHoursPerWeekRt>
        <IndividualTrusteeOrDirectorInd>X</IndividualTrusteeOrDirectorInd>
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      <Form990PartVIISectionAGrp>
        <PersonNm>Sanjay J Wagle</PersonNm>
        <TitleTxt>Director</TitleTxt>
        <AverageHoursPerWeekRt>1.00</AverageHoursPerWeekRt>
        <IndividualTrusteeOrDirectorInd>X</IndividualTrusteeOrDirectorInd>
        <ReportableCompFromOrgAmt>0</ReportableCompFromOrgAmt>
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      <Form990PartVIISectionAGrp>
        <PersonNm>Philip Duffy</PersonNm>
        <TitleTxt>Past President &amp; Executive Director</TitleTxt>
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        <OfficerInd>X</OfficerInd>
        <ReportableCompFromOrgAmt>446683</ReportableCompFromOrgAmt>
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      <Form990PartVIISectionAGrp>
        <PersonNm>Robert Max Holmes</PersonNm>
        <TitleTxt>President &amp; Chief Executive Officer</TitleTxt>
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        <ReportableCompFromRltdOrgAmt>0</ReportableCompFromRltdOrgAmt>
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      <Form990PartVIISectionAGrp>
        <PersonNm>Corrie Martin</PersonNm>
        <TitleTxt>COO</TitleTxt>
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      <Form990PartVIISectionAGrp>
        <PersonNm>Wayne Walker</PersonNm>
        <TitleTxt>Chief Scientific Officer PI</TitleTxt>
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      <Form990PartVIISectionAGrp>
        <PersonNm>John Arsenault</PersonNm>
        <TitleTxt>VP of Finance</TitleTxt>
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      <Form990PartVIISectionAGrp>
        <PersonNm>Christopher Neill</PersonNm>
        <TitleTxt>Senior Scientist, PI</TitleTxt>
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      <Form990PartVIISectionAGrp>
        <PersonNm>Christopher Schwalm</PersonNm>
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      <Form990PartVIISectionAGrp>
        <PersonNm>Michael Coe</PersonNm>
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      <Form990PartVIISectionAGrp>
        <PersonNm>Linda Deegan</PersonNm>
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      <Form990PartVIISectionAGrp>
        <PersonNm>Susan Natali</PersonNm>
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            <BusinessNameLine1Txt>CliftonLarsonAllen LLP</BusinessNameLine1Txt>
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        <ContractorAddress>
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            <AddressLine1Txt>PO Box 829709</AddressLine1Txt>
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      <ContractorCompensationGrp>
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        <ContractorAddress>
          <USAddress>
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            <CityNm>Princeton</CityNm>
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      <ContractorCompensationGrp>
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          <USAddress>
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            <ZIPCd>02116</ZIPCd>
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      <ContractorCompensationGrp>
        <ContractorName>
          <BusinessName>
            <BusinessNameLine1Txt>Robert Half</BusinessNameLine1Txt>
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          <USAddress>
            <AddressLine1Txt>12400 Collections Center Drive</AddressLine1Txt>
            <CityNm>Chicago</CityNm>
            <StateAbbreviationCd>IL</StateAbbreviationCd>
            <ZIPCd>60693</ZIPCd>
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        <ContractorName>
          <BusinessName>
            <BusinessNameLine1Txt>Marts &amp; Lundy</BusinessNameLine1Txt>
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          <USAddress>
            <AddressLine1Txt>160 Chubb Ave Suite 303</AddressLine1Txt>
            <CityNm>Lyndhurst</CityNm>
            <StateAbbreviationCd>NJ</StateAbbreviationCd>
            <ZIPCd>07071</ZIPCd>
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      <TotalContributionsAmt>26619062</TotalContributionsAmt>
      <ProgramServiceRevenueGrp>
        <Desc>Contract revenue</Desc>
        <BusinessCd>900099</BusinessCd>
        <TotalRevenueColumnAmt>4445652</TotalRevenueColumnAmt>
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        <ExclusionAmt>1384772</ExclusionAmt>
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        <OtherAmt>49676</OtherAmt>
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        <ExclusionAmt>138662</ExclusionAmt>
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        <UnrelatedBusinessRevenueAmt>0</UnrelatedBusinessRevenueAmt>
        <ExclusionAmt>1523434</ExclusionAmt>
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        <ProgramServicesAmt>4815202</ProgramServicesAmt>
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        <ProgramServicesAmt>517772</ProgramServicesAmt>
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        <ProgramServicesAmt>1203845</ProgramServicesAmt>
        <ManagementAndGeneralAmt>357843</ManagementAndGeneralAmt>
        <FundraisingAmt>134281</FundraisingAmt>
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        <ProgramServicesAmt>629140</ProgramServicesAmt>
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        <ProgramServicesAmt>755489</ProgramServicesAmt>
        <ManagementAndGeneralAmt>224569</ManagementAndGeneralAmt>
        <FundraisingAmt>84269</FundraisingAmt>
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        <ProgramServicesAmt>80652</ProgramServicesAmt>
        <ManagementAndGeneralAmt>83554</ManagementAndGeneralAmt>
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        <ProgramServicesAmt>46610</ProgramServicesAmt>
        <ManagementAndGeneralAmt>1057793</ManagementAndGeneralAmt>
        <FundraisingAmt>35900</FundraisingAmt>
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        <FundraisingAmt>172444</FundraisingAmt>
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      <FeesForSrvcInvstMgmntFeesGrp>
        <TotalAmt>65830</TotalAmt>
        <ManagementAndGeneralAmt>65830</ManagementAndGeneralAmt>
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      <FeesForServicesOtherGrp>
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        <ProgramServicesAmt>535391</ProgramServicesAmt>
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        <ProgramServicesAmt>30828</ProgramServicesAmt>
        <ManagementAndGeneralAmt>39128</ManagementAndGeneralAmt>
        <FundraisingAmt>6941</FundraisingAmt>
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        <ProgramServicesAmt>202384</ProgramServicesAmt>
        <ManagementAndGeneralAmt>249118</ManagementAndGeneralAmt>
        <FundraisingAmt>83719</FundraisingAmt>
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        <ManagementAndGeneralAmt>294363</ManagementAndGeneralAmt>
        <FundraisingAmt>52218</FundraisingAmt>
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        <ProgramServicesAmt>25317</ProgramServicesAmt>
        <ManagementAndGeneralAmt>344748</ManagementAndGeneralAmt>
        <FundraisingAmt>1644</FundraisingAmt>
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      <TravelGrp>
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        <ProgramServicesAmt>1326463</ProgramServicesAmt>
        <ManagementAndGeneralAmt>221994</ManagementAndGeneralAmt>
        <FundraisingAmt>140626</FundraisingAmt>
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        <ProgramServicesAmt>307396</ProgramServicesAmt>
        <ManagementAndGeneralAmt>297176</ManagementAndGeneralAmt>
        <FundraisingAmt>67669</FundraisingAmt>
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        <ManagementAndGeneralAmt>33119</ManagementAndGeneralAmt>
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        <ProgramServicesAmt>72422</ProgramServicesAmt>
        <ManagementAndGeneralAmt>586431</ManagementAndGeneralAmt>
        <FundraisingAmt>684</FundraisingAmt>
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        <ProgramServicesAmt>32897</ProgramServicesAmt>
        <ManagementAndGeneralAmt>41754</ManagementAndGeneralAmt>
        <FundraisingAmt>7407</FundraisingAmt>
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        <Desc>Common costs</Desc>
        <TotalAmt>1486596</TotalAmt>
        <ProgramServicesAmt>1092351</ProgramServicesAmt>
        <ManagementAndGeneralAmt>297216</ManagementAndGeneralAmt>
        <FundraisingAmt>97029</FundraisingAmt>
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      <OtherExpensesGrp>
        <Desc>Research supplies</Desc>
        <TotalAmt>404152</TotalAmt>
        <ProgramServicesAmt>404152</ProgramServicesAmt>
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        <TotalAmt>31029018</TotalAmt>
        <ProgramServicesAmt>21809237</ProgramServicesAmt>
        <ManagementAndGeneralAmt>7205229</ManagementAndGeneralAmt>
        <FundraisingAmt>2014552</FundraisingAmt>
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        <EOYAmt>2847411</EOYAmt>
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        <EOYAmt>26932781</EOYAmt>
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      <PledgesAndGrantsReceivableGrp>
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        <EOYAmt>15153941</EOYAmt>
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      <AccountsReceivableGrp>
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        <EOYAmt>1896724</EOYAmt>
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      <PrepaidExpensesDefrdChargesGrp>
        <BOYAmt>238606</BOYAmt>
        <EOYAmt>370584</EOYAmt>
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      <LandBldgEquipBasisNetGrp>
        <BOYAmt>5532742</BOYAmt>
        <EOYAmt>5742118</EOYAmt>
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      <InvestmentsPubTradedSecGrp>
        <BOYAmt>9968619</BOYAmt>
        <EOYAmt>13166802</EOYAmt>
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      <OtherAssetsTotalGrp>
        <BOYAmt>337313</BOYAmt>
        <EOYAmt>335951</EOYAmt>
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      <TotalAssetsGrp>
        <BOYAmt>63603476</BOYAmt>
        <EOYAmt>66446312</EOYAmt>
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      <AccountsPayableAccrExpnssGrp>
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        <EOYAmt>3298927</EOYAmt>
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        <PersonNm>Michael Coe</PersonNm>
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        <PersonNm>Susan Natali</PersonNm>
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      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Part I, Line 7</FormAndLineReferenceDesc>
        <ExplanationTxt>At times the Organization provides employees with additional performance-based compensation. At the discretion of the President/CEO, the bonus provided in 2023 for all staff was provided to recognize excellent work by those individuals over the prior fiscal year. The amount provided as bonuses was generally 3% of base compensation for all employees, determined to be appropriate by the CEO, with exceptions made in some cases where additional compensation was deemed warranted. The President/CEO's employment contract provides for a merit based bonus if approved by the Board of Directors. The Board determines incentive goals each year and then annually determines whether sufficient progress toward those goals has been made. In 2023 the Board approved a bonus to the President/CEO in the amount indicated based on successful attainment of those incentive goals.</ExplanationTxt>
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        <BondReferenceCd>A</BondReferenceCd>
        <IssuerName>
          <BusinessNameLine1Txt>Massachusetts Health &amp; Educational Facilities Authority (MA)</BusinessNameLine1Txt>
        </IssuerName>
        <BondIssuerEIN>042456011</BondIssuerEIN>
        <CUSIPNum>57586ELD1</CUSIPNum>
        <BondIssuedDt>2009-08-14</BondIssuedDt>
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        <PurposeDesc>Renovation of Carriage House - $603,900; Current Refunding - $1,927,584</PurposeDesc>
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        <CapitalExpendituresAmt>603900</CapitalExpendituresAmt>
        <SubstantialCompletionYr>2010</SubstantialCompletionYr>
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        <AdequateBooksAndRecMaintInd>1</AdequateBooksAndRecMaintInd>
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      <TaxExemptBondsPrivateBusUseGrp>
        <BondReferenceCd>A</BondReferenceCd>
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        <MgmtContractBondFincdPropInd>0</MgmtContractBondFincdPropInd>
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      </TaxExemptBondsPrivateBusUseGrp>
      <TaxExemptBondsArbitrageGrp>
        <BondReferenceCd>A</BondReferenceCd>
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        <ProceduresCorrectiveActionInd>1</ProceduresCorrectiveActionInd>
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      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part I, Line 1, Description of Organization Mission:</FormAndLineReferenceDesc>
        <ExplanationTxt>Woodwell Climate Research Center is an organization of scientists who work with a worldwide network of partners to understand and manage climate change. We bring together 35 years of hands-on research experience and policy impact to find societal-scale solutions that can be put into immediate action.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part VI, Section A, line 2</FormAndLineReferenceDesc>
        <ExplanationTxt>Robert Max Holmes and Stephanie Tomasky have a family relationship through marriage.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part VI, Section B, line 11b</FormAndLineReferenceDesc>
        <ExplanationTxt>Form 990 is drafted by the Center's independent auditors and reviewed by senior management and the Chairs of the Board, Audit and Finance Committees. Once reviewed, a complete copy of the return is furnished to all board members before filing.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part VI, Section B, line 12c</FormAndLineReferenceDesc>
        <ExplanationTxt>Reported conflicts are reviewed and addressed as needed with disclosure and/or recusal of individuals from decision making as appropriate.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part VI, Section B, line 15</FormAndLineReferenceDesc>
        <ExplanationTxt>The Compensation Committee of the board determines the CEO's compensation using comparability data, external sources and histroic data. The decision making process is documented by the Chair. In some cases, recruitment organizations are used and all compensation decisions reference regular compensation surveys by outside firms.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part VI, Section C, line 19</FormAndLineReferenceDesc>
        <ExplanationTxt>The Center's financial statements are available by request and on our website (www.woodwellclimate.org). The Center makes available its governance documents or its conflict of interest policy when requested.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part XI, line 9:</FormAndLineReferenceDesc>
        <ExplanationTxt>Change in value of split-interest agreements 3,730.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part XII, Line 2c:</FormAndLineReferenceDesc>
        <ExplanationTxt>The Organization has a separate chartered Audit Committee that selects the independent accountant, subject to approval by the board, approves fees and statements and reviews audit opinions and findings. Statements are reviewed in a plenary board meeting and individuals may raise questions to the independent accountant.</ExplanationTxt>
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