But officials emphasized that the restrictions will largely freeze new exploration, while not disrupting projects already under way.
But Dr. Johnson contends that the discount rate needs to be lower because climate change has the potential to severely disrupt projected economic growth.
Road crews largely financed by American and international aid have long been targets for insurgents hoping to disrupt projects that are signs of progress.
Outside the Amazon, recent strikes, some of them violent, have also disrupted projects under construction by the oil giant Petrobras, including the Comperj petrochemical complex in Rio de Janeiro, the Barra do Riacho port in Espírito Santo State and the Abreu e Lima refinery in the northeast.
The Taliban, still an active threat in Afghanistan, has vowed to disrupt the project if American firms are involved.
Even a short delay could disrupt the project's computerized system, which coordinates cues between images, landscape, sound design and performances.
A spokesman for Mr. McGreevey said he was pleased that the state attorney general was looking into the matter, as it may disrupt the project.
Its members don't discuss plans on the telephone or give away details, out of fear that the security services will disrupt the project.
This disrupted the project, a joint venture with a Chinese company, which then backed out — a loss for the American company of hundreds of millions of dollars, Mr. Sullivan said, that could have been avoided with a better assessment before the man left home.
At an authority committee meeting last month, officials suggested that a single unfortunate bet had disrupted the project: While other transit agencies invested in contactless payment systems that they would construct themselves, the authority had hoped to evade the burden and cost of building its own.
The explosion last weekend in Iran that killed 17 members of the armed forces, including a founder of the country's missile program, occurred while researchers were working on weapons capable of delivering Israel a "strong punch in the mouth" and disrupted their project by a few days, the Iranian military chief of staff said Wednesday.
