The province, which has said it will cut greenhouse gas emissions by 33 percent by 2020, announced it was joining the regional pact on Tuesday, just as the Canadian government was set to release its own plan to fight climate change. The federal Canadian plan is expected to call for a 20 percent cut in emissions linked to global warming by 2020.
The Western Regional Climate Action Initiative formed in February calls on members to develop a regional target in six months for reducing emissions, and to devise a market-based plan to do that during the next 18 months.
The group comprises Oregon, California, New Mexico, Arizona and Washington state, and the pact is seen as a move to bypass the Bush administration to take more aggressive action in the flight against global warming.
Schwarzenegger and governors of at least two more states are scheduled to meet British Columbia Premier Gordon Campbell in May. Schwarzenegger has said he would like other Canadian provinces to join.
An aide to the governor told the Vancouver Sun newspaper he also expected some unnamed Australian states to announce in the next few days plans their support for international trading of carbon credits.