The international climate change negotiations entering their second and final week encompass a vast and complicated array of political, economic and legal questions. But at bottom, the talks boil down to two issues: trust and money.

In this global forum, no one questions the established science that greenhouse gases from burning fossil fuels are warming the planet — or that both developed and developing economies must all eventually lower their greenhouse emissions to stave off a future that could wreak havoc on the world’s safety and economic stability.

In a major breakthrough, 184 governments have already submitted plans detailing how they will cut their domestic emissions after 2020.

Those pledges are expected to make up the core of a new accord, which could be signed next weekend. The agreement is also expected to require countries to return to the table at least once every 10 years with even more stringent emissions reduction pledges.

But can those governments be trusted to do what they say they will do?

That is the crucial question that will determine whether a Paris climate change accord has teeth, or whether it is little more than an expression of good will.

The United States is pushing for aggressive, legally binding provisions that would require governments to monitor, verify and report their emissions reductions to an international body. But many developing nations have balked at such provisions, calling them intrusive and a potential violation of sovereignty.

The issue has emerged as a point of tension between the United States and China, after the two countries last year celebrated a breakthrough on climate policy, announcing a joint plan to reduce their future emissions.

But last month it was discovered that China was burning 17 percent more coal than it had previously reported. That episode highlighted the need for an outside body to verify countries’ emissions reductions, many observers said.

“Transparency is an enormously important part of this,” said Todd Stern, the American climate change negotiator. “One hundred and eighty-four countries have put forth targets. The transparency regime is the thing that will allow everyone to have confidence and trust that other countries are acting. It is at the core of this deal.”

Asked about the issue at a news briefing, the Chinese negotiator Su Wei said simply, “Transparency would be very important to build mutual confidence and trust,” adding, “This is one of the key issues to be resolved.”

Mr. Stern said that the United States would like to see the creation of an international body of experts who would monitor and review how countries are following through on their emissions-reduction pledges. That idea has been likened to a climate-change version of the International Atomic Energy Agency, the nuclear weapons watchdog.

Another method to verify changes in global emissions could be the use of satellites to monitor tree coverage in countries like Brazil and Indonesia, which have pledged to reduce mass deforestation, a major source of greenhouse gas pollution.

“We have been defending transparency mechanisms provided they are nonintrusive, that the work is done on a cooperative way, and that the required support for the countries to undertake the work is there,” said Antonio Marcondes, the Brazilian climate change envoy. “But intrusiveness is not welcome.”

One difficulty for many countries is that they do not have the basic government accounting resources to track and monitor their industrial carbon pollution.

“We agree in principle,” with the idea of a strong verification regime, said the chief climate negotiator for Indonesia, Rachmat Witoelar. “But there are some prerequisites to that. Some of the countries need technical assistance and capacity assistance to do what is asked.”

Mr. Stern has also supported proposals in which developed nations with strong monitoring and data-crunching agencies would supply expertise to help poor countries create new institutions to measure and track their emissions. It is unclear whether that support would include a fresh allocation of United States taxpayer dollars.

That would be an intensely contentious proposal, coming in the context of the already explosive fight over money.

At the heart of the financial fight is a pledge made in 2009 by Secretary of State Hillary Clinton that developed countries would mobilize $100 billion annually to help poor countries transform their energy systems from fossil fuel dependency to reliance on clean energy sources, and to adapt to the ravages of climate change.

But rich countries such as the United States have insisted that most of that money come from private investments, rather than taxpayer dollars.

President Obama’s initial pledge of $3 billion in climate finance over three years is already meeting with fierce objections from Congress.

But India has demanded that a final text include legally binding language that would commit the developed world to allocating the money from public funds.

“We will push for an increase in public spending,” said Ajay Mathur, an Indian climate change negotiator. “We want developed countries to provide resources that can help mobilize capital. The amounts that have been pledged are not enough.”

He added: “Finance is the easiest thing. All you have to do is write a check.”

Despite the standoffs, many negotiators and observers here say they are confident that a deal is in sight.

That is in part, they say, because of an optimistic and collegial mood created by the fact that, with the submission of the individual climate pledges, negotiations are further along than they have ever been in the unsuccessful two-decade process to form a climate pact.

There is also a sense of good will toward the French hosts of the summit meeting, in the wake of the terrorist attacks that killed 130 people in Paris last month. Top French officials have demonstrated an intense emotional commitment toward forging a deal.

In a speech Saturday night to the plenary session, the French foreign minister, Laurent Fabius, clearly emotional, spoke of the urgent need to reach a deal.

“We’re talking about life itself,” he said.

He added, “I intend to muster the experience of my entire life to the service of success for next Friday.”

Given the emotional sensitivity of the moment, and the sympathy toward France, it is unlikely, say experts, that any one country would take action to block a deal entirely.

“I think if a country were to go up against France right now, it would be looked at so badly in the broader global context,” said Jennifer Morgan, an expert in climate change negotiations at the World Resources Institute, a research organization.

However, she added, in their efforts to forge a deal no matter what, it is possible that negotiators may water down demands or simply remove crucial elements from the text — weakening the policy outcome in order to end up with a positive political moment.

“Instead of spoilers,” she said, “they could push to make the deal as weak as possible.”