So he has given warning that heated argument might jeopardise Hong Kong's "stability and development".
His team-mate Jenson Button, meanwhile, has given warning that Hamilton will be a hard act to follow at McLaren.
The leader of Pakistan's biggest religious party, Jamaat-e-Islami, has given warning that "millions" will take to the streets if the attacks in Afghanistan continue.
It may reflect a tactical need to defuse a campaign that is being supported by loyalists of Thaksin Shinawatra, the prime minister they ousted.One of General Surayud's security advisers has given warning that favouring Buddhism could further inflame the separatist insurgency in the Muslim-dominated south.
Even if this war is a short one a month, say and there are no accompanying terrorist attacks, it could be enough to stop the industry's fragile recovery in its tracks, as the chairman of Publicis, a French advertising giant, has given warning.
An educational expert has given warning that schools and parents risk creating a generation of brittle, high-achieving teenage girls who are unable to cope with failure and who fall apart if they fail to live up to their own self-image as innately intelligent.
William Swing, its head, has given warning against pulling out before the job is done.
Sun has given warning that it would now consider a civil suit against Microsoft.
Mr Mousavi has given warning that stealing the elections would damage the foundations of the Islamic republic.
The company has given warning that full-year earnings will be "significantly below" its earnings-growth target of 10%.
Mr Bush wants its terms to be imposed strictly and has given warning of a "zero tolerance" policy.
