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Wednesday’s joint U.S.-China declaration says that both countries will “accelerate the transition to a global net zero economy,” referring to the goal of net zero emissions of carbon dioxide, the most important greenhouse gas. It also calls on both countries to strengthen their emissions plan.

In addition, China agreed to “phase down” coal consumption during its 15th Five Year Plan, which starts in 2026.

However, the agreement did not extract any new pledges from China about when it will stop spewing ever-larger amounts of fossil fuel emissions into the atmosphere and instead begin to reverse course.

China has said it will stop increasing its greenhouse gas emissions before 2030, which it often refers to as the date they will “peak.” But in Wednesday’s agreement, China did not specify exactly when that would occur, and American officials have been pushing their counterparts to set a clear, earlier date.

Mr. Kerry on Wednesday said the two countries discussed the issue many times, and insisted that the new agreement pushed China in the direction of bending the curve of emissions downward soon.

Manish Bapna, the president of the Natural Resources Defense Council, a Washington-based environmental group, said the agreement was “good news.” But, he said, “If we are to hold global warming to 1.5 degrees Celsius, we urgently need to see commitments to cooperate translate into bolder climate targets and credible delivery.”