ARNHEM, The Netherlands, July 10 /PRNewswire/ --     ARCADIS (EURONEXT: ARCAD), the international consultancy, design,
engineering and management services company, announced today that the Company
has been selected by the Cleantech Group(TM), LLC to join its prestigious
Cleantech Index(TM) (AMEX: CTIUS) of public cleantech companies, effective
June 30, 2008.

The Cleantech Group's Cleantech Index is the first, and only, equity
index to offer investors and index licensees an easy, liquid and
cost-effective way to track and invest in the broad cleantech category.
Unlike indices that specifically track narrow sectors such renewable energy
or water, the Cleantech Index includes the leading companies from a broad
range of sectors such as advanced materials, agriculture, transportation,
manufacturing, in addition to energy efficiency, renewables and water.

Now comprised of 76 publicly traded companies, the Cleantech Index is the
industry gold standard upon which a growing range of financial products are
based. In 2007, the Index outperformed the S&P 500 Index by 37.4%, over the
last 12 months by 26.3%, and in 2008 (through June 27) by 6.5%.

"ARCADIS is the world's leading provider of environmental services to
private sector companies, and as such it is logical that we are now included
in this index," says ARCADIS CEO Harrie Noy. "In addition, we have a stated
goal of becoming the global leader in sustainability in our business, further
underlining the right choice Cleantech has made."

"ARCADIS' addition to the Cleantech Index reflects the significance of
the company to global cleantech investors," said Rafael Coven, Managing
Director of Cleantech Indices for the Cleantech Group, LLC, and Index
Advisor.

With its inclusion in the Cleantech Index, ARCADIS is also now being
traded in funds based upon CTIUS, including the PowerShares Cleantech
Portfolio ETF (Amex: PZD) and KSM Cleantech ETF (Bloomberg: KSMCLNT:IT) in
Israel, among others.

About ARCADIS

ARCADIS is an international company providing consultancy, design and
engineering and management services in infrastructure, environment and
buildings, to enhance mobility, sustainability and quality of life. ARCADIS
develops, designs, implements, maintains and operates projects for companies
and governments. With more than 13,500 employees and EUR 1.5 billion in gross
revenue, the company has an extensive international network that is supported
by strong local market positions. Visit us on the internet:
http://www.arcadis-global.com

About the Cleantech Group, LLC

The Cleantech Group pioneered the cleantech investment category in 2002.
Today, it accelerates the development and market adoption of clean
technologies globally through membership in the largest global network of
investors and companies, representing more than US$3 trillion in assets. 
Member investors, growth companies/vendors, enterprises, service providers, 
and others receive access to capital, investment opportunities, market 
leading research and data, insight, sales opportunities, human capital, and
promotional opportunities. The Cleantech Group also produces the premier
Cleantech Forum events worldwide. Details at http://www.cleantech.com.

For more information on the Cleantech Index:
http://www.cleantechindex.com/