Global revenues from clean tech businesses--including air and water purification, advanced materials, distributed power generation, renewable energy, and process controls, such as sensors to monitor air and water--now surpass 85 billion pounds, according to the Cleantech Venture Network, a for-profit membership group that connects venture and institutional investors with entrepreneurs.

FORBES

It supports processes that we all often take for granted, such as air quality, climate regulation, water purification, parasite and disease control, pollination and the prevention of erosion.

UNESCO: Message by UNESCO Director-General Irina Bokova