California governor Arnold Schwarzenegger has told the US President to face up to the threat of global warming.
Ahead of this week's G8 summit where the environment is top of the agenda, the former actor said: "The debate is over."
George Bush has been barracked around the world for his stance on the environment and reluctance to sign to up to accords tackling global warming as they may harm the US economy.
His reported willingness to block a deal during the G8 summit at Gleneagles addressing environmental dangers may lead the other seven leaders to sign an agreement excluding the US.
Writing in the Independent on Sunday, Mr Schwarzenegger, governor of the most powerful financial US state, said there could be no doubt as to the dangers faced by Earth.
Without explicitly mentioning Mr Bush, he said: "The debate is over.
"We know the science. We see the threat posed by changes in our climate. And we know the time for action is now.
"We have no choice but to take action to reduce greenhouse gas emissions."
California has taken a much harder stance than the US Government on pollution, aiming to reduce overall greenhouse gas emissions to 80% below 1990 levels, even more ambitious than the 60% goal for the UK.
Mr Schwarzenegger added: "Many people have falsely assumed that you have to choose between protecting the environment and protecting the economy. Nothing could be further from the truth."
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even arnie is smarter than bush