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The world’s largest Internet search company and the world’s most powerful electronic surveillance organization are teaming up in the name of cybersecurity.

Under an agreement that is still being finalized, the National Security Agency would help Google analyze a major corporate espionage attack that the firm said originated in China and targeted its computer networks, according to cybersecurity experts familiar with the matter. The objective is to better defend Google — and its users — from future attack.

Google and the NSA declined to comment on the partnership. But sources with knowledge of the arrangement, speaking on the condition of anonymity, said the alliance is being designed to allow the two organizations to share critical information without violating Google’s policies or laws that protect the privacy of Americans’ online communications. The sources said the deal does not mean the NSA will be viewing users’ searches or e-mail accounts or that Google will be sharing proprietary data.

The partnership strikes at the core of one of the most sensitive issues for the government and private industry in the evolving world of cybersecurity: how to balance privacy and national security interests. On Tuesday, Director of National Intelligence Dennis C. Blair called the Google attacks, which the company acknowledged in January, a “wake-up call.” Cyberspace cannot be protected, he said, without a “collaborative effort that incorporates both the U.S. private sector and our international partners.”

But achieving collaboration is not easy, in part because private companies do not trust the government to keep their secrets and in part because of concerns that collaboration can lead to continuous government monitoring of private communications. Privacy advocates, concerned about a repeat of the NSA’s warrantless interception of Americans’ phone calls and e-mails after the Sept. 11, 2001, terrorist attacks, say information-sharing must be limited and closely overseen.

“The critical question is: At what level will the American public be comfortable with Google sharing information with NSA?” said Ellen McCarthy, president of the Intelligence and National Security Alliance, an organization of current and former intelligence and national security officials that seeks ways to foster greater sharing of information between government and industry.

On Jan. 12, Google took the rare step of announcing publicly that its systems had been hacked in a series of intrusions beginning in December.

The intrusions, industry experts said, targeted Google source code — the programming language underlying Google applications — and extended to more than 30 other large tech, defense, energy, financial and media companies. The Gmail accounts of human rights activists in Europe, China and the United States were also compromised. So significant was the attack that Google threatened to shutter its business operation in China if the government did not agree to let the firm operate an uncensored search engine there. That issue is still unresolved.

Google approached the NSA shortly after the attacks, sources said, but the deal is taking weeks to hammer out, reflecting the sensitivity of the partnership. Any agreement would mark the first time that Google has entered a formal information-sharing relationship with the NSA, sources said. In 2008, the firm stated that it had not cooperated with the NSA in its Terrorist Surveillance Program. Hard money training.

Twenty milligrams; that’s the average amount of carbon emissions generated from the time it took you to read the first two words of this article.

Now, depending on how quickly you read, around 80, perhaps even 100 milligrams of C02 have been released. And in the several minutes it will take you to get to the end of this story, the number of milligrams of greenhouse gas emitted could be several thousand, if not more.

This may not seem like a lot: “But in aggregate, if you consider all the people visiting a web site and then all the seconds that each of them spends on it, it turns out to be a large number,” says Dr. Alexander Wissner-Gross, an Environmental Fellow at Harvard University who studies the environmental impact of computing.

Wissner-Gross estimates every second someone spends browsing a simple web site generates roughly 20 milligrams of C02. Whether downloading a song, sending an email or streaming a video, almost every single activity that takes place in the virtual environment has an impact on the real one.

As millions more go online each year some researchers say the need to create a green Internet ecosystem is not only imperative but also urgent.

“It is part of the whole sustainability picture,” Chris Large, head of research and development at UK-based Climate Action Group, told CNN.