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Proc-Type: 2001,MIC-CLEAR
Originator-Name: webmaster@www.sec.gov
Originator-Key-Asymmetric:
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 TWSM7vrzLADbmYQaionwg5sDW3P6oaM5D3tdezXMm7z1T+B+twIDAQAB
MIC-Info: RSA-MD5,RSA,
 Szav+WPP2bM9yDaO96jC0TiXq7J/kp2dP208YCRebhz/XqCsSndRGiktKcIiCjiD
 EtfeYK9lG6D+M2QyfJSDUg==

<SEC-DOCUMENT>9999999995-07-003778.txt : 20070926
<SEC-HEADER>9999999995-07-003778.hdr.sgml : 20070926
<ACCEPTANCE-DATETIME>20070926001517
ACCESSION NUMBER:		9999999995-07-003778
CONFORMED SUBMISSION TYPE:	EFFECT
PUBLIC DOCUMENT COUNT:		1
FILED AS OF DATE:		20070925
DATE AS OF CHANGE:		20070926
EFFECTIVENESS DATE:		20070925

FILER:

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			BlackRock EcoSolutions Investment Trust
		CENTRAL INDEX KEY:			0001403238
		IRS NUMBER:				000000000
		STATE OF INCORPORATION:			DE
		FISCAL YEAR END:			1031

	FILING VALUES:
		FORM TYPE:		EFFECT
		SEC ACT:		1933 Act
		SEC FILE NUMBER:	333-143800
		FILM NUMBER:		071135399

	BUSINESS ADDRESS:	
		STREET 1:		100 BELLEVUE PARKWAY
		CITY:			WILMINGTON
		STATE:			DE
		ZIP:			19809
		BUSINESS PHONE:		800-882-0052

	MAIL ADDRESS:	
		STREET 1:		100 BELLEVUE PARKWAY
		CITY:			WILMINGTON
		STATE:			DE
		ZIP:			19809

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	BlackRock Alternative Energy & Resource Trust
		DATE OF NAME CHANGE:	20070614
</SEC-HEADER>
<DOCUMENT>
<TYPE>EFFECT
<SEQUENCE>1
<FILENAME>primary_doc.xml
<TEXT>
<XML>
<?xml version="1.0"?>
<edgarSubmission>

    <schemaVersion>X0101</schemaVersion>

    <submissionType>EFFECT</submissionType>

    <act>33</act>

    <testOrLive>LIVE</testOrLive>

    <effectiveData>
        <finalEffectivenessDispDate>2007-09-25</finalEffectivenessDispDate>
        <finalEffectivenessDispTime>13:15:00</finalEffectivenessDispTime>
        <form>N-2</form>
        <filer>
            <cik>0001403238</cik>
            <entityName>BlackRock EcoSolutions Investment Trust</entityName>
            <fileNumber>333-143800</fileNumber>
        </filer>
    </effectiveData>
</edgarSubmission>
</XML>
</TEXT>
</DOCUMENT>
</SEC-DOCUMENT>
-----END PRIVACY-ENHANCED MESSAGE-----