Agenda 21 estimates roughly that the construction activities of developing countries amount to about US$ 400 billion annually and increase by about $20 billion annually. The stream of new investments for these levels of activity and to bring in clean technologies is estimated at $40 billion annually, primarily from private sources. If 10% of the new investments came from the international community, this would amount to US$ 4,000 million annually. About US$ 3 million would be needed to strengthen international organizations.