Saintly Al Gore has an odd new sugar daddy - Dow

Al Gore, the self-styled squeakiest-clean and deepest-green politician in American history, has some explaining to do this weekend. His environmental organisation has taken money to raise awareness about the need for clean water from a controversial chemicals company involved in the aftermath of one of the world's worst pollution disasters.

Dow Chemical, the US firm which now owns the leaking pesticides factory responsible for thousands of deaths in Bhopal, India, is sponsoring Life Earth events in 150 cities today. The event aims to raise money for clean water programmes. Research by environmental organisations has found dangerous levels of highly toxic chemicals in rivers, lakes and other water supplies close to several other factories owned by Dow and its subsidiaries in countries including the United States, Brazil and South Africa.

Dow's factories at its global headquarters in Midland, Michigan, have been accused of contaminating the region, including the Tittabawassee River floodplains, with high levels of dioxin – one of the "dirty dozen" most dangerous chemicals. In 2007, the highest level of dioxin contamination ever measured by the US Environmental Protection Agency was found in the Michigan Saginaw River. Residents are advised to avoid contact with river sediments and not to eat locally caught fish.