City officials in San Francisco plan to block local government agencies from buying new Apple Macintosh computers.

旧金山市官员计划阻止政府部门购买新款苹果Macintosh电脑。

The move follows the firm's decision to pull out of a green certification scheme designed to identify which electronic devices pose the least risk to the environment.

CIO Journal reported the ban was designed to encourage Apple to reconsider.

It noted¹ local officials spent $45,579 (£29,365) on Apple equipment in 2010.

The sum is a fraction of the firm's $65bn net sales the same year, but the fact that its Cupertino headquarters is about 70km away from San Francisco (43 miles) and many of its staff live in the city have helped the act gain attention.

San Francisco's chief information officer told the BBC that his decision was in line with（符合） a long running policy to opt² for equipment listed on the EPEAT (Electronic Product Environmental Assessment³ Tool) registry.

"San Francisco has reached out to Apple and is hopeful that a solution to this challenge can be found in the future," said Jon Walton.

But a statement from Apple suggested it had no plans to reverse its decision.

"Apple takes a comprehensive approach to measuring our environmental impact and all of our products meet the strictest energy efficiency standards backed by the US government," a spokeswoman said.

"We also lead the industry by reporting each product's greenhouse gas emissions⁴ on our website, and Apple products are superior in other important environmental areas not measured by EPEAT, such as removal of toxic⁵ materials."