Those who signed include Angela Davis, Mark Ruffalo, John Cusack, and Kathleen Hanna.
Industry officials say there is no evidence the sport is cruel to animals.
What type of young person joins politics when they could be out getting drunk?
Rob Greenfield has rubbish taste in clothes - to make a point about waste.
A group of protesters caused a big stir in Mission Bay on Saturday.
Protesters erupted in cheers as a herd of buffalo appeared at the Standing Rock reserve, where demonstrations have taken place against the construction of an oil pipeline.
Veteran social activist and politician Tom Hayden has died after a lengthy illness. He was 76.
Two investigations are underway following complaints over a major aerial 1080 operation near Te Anau.
Grey's Anatomy star Jesse Williams stole the show at the BET Awards on Sunday night (local time), with a stirring and confrontational speech about activism and race in the United States.
MPs who walked out of Parliament in protest against John Key's "you back the rapists" comment have been handed a petition calling on him to apologise.
A group of climate change advocates who scaled the walls of Parliament will learn their punishment today.
Pioneering US civil rights activist Julian Bond has died aged 75.