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James Hansen got US politicians to listen to his warnings about climate change in 1988.
In 1997, a patch of plastic waste was discovered in the middle of the Pacific Ocean
When Iraq's marshes became a hiding place for rebels, Saddam Hussein destroyed them.
Since 1975, San Diego Zoo has been deep-freezing cell samples from rare species
A book that helped launch the green movement highlighted the damage caused by pesticides
A flightless bird, the dodo was extinct just decades after being discovered by Europeans
A reactor caught fire at the Windscale nuclear plant in the north of England in 1957
Meticulously recorded levels of CO2 in the atmosphere show how our climate is changing
In the mid 1960s a Dutch engineer came up with a scheme to share bikes and cut pollution.
Forty five years ago it was the biggest oil spill the world had ever seen.
Did a nerve agent kill 6,000 sheep close to a US military testing site in 1968?
In June 1969 the heavily polluted Cuyahoga River, in Ohio in the USA, caught fire
Dr Norman Borlaug鈥檚 pioneering work on disease-resistant grains saved millions.
In 1970, 20 million Americans came out to demonstrate for a sustainable environment.
On June 27th 1975 Greenpeace activists launched their first direct action against whalers
Remembering the Brazilian environmental campaigner Chico Mendes, shot dead in 1988
In March 1989, the Exxon Valdez went aground, spilling 11 million gallons of oil
In 2004, the Kenyan ecologist became the first African woman to win the Nobel Peace Prize
How campaigners fought to stop the 'Khian Sea' from off-loading tons of US waste abroad
The man who first coralled the international community to hold an environment summit
Worries about the industrialisation of farming post-WW2 led some farmers to go organic.
