In recent months, Washington has had a lot to say about China’s ever-expanding air, naval, and missile power. But when Pentagon officials address the topic, they generally speak less about that country’s current capabilities, which remain vastly inferior to those of the United States, than the world they foresee in the 2030s and 2040s, when Beijing is expected to have acquired far more sophisticated weaponry.

“China has invested heavily in new technologies, with a stated intent to complete the modernization of its forces by 2035 and to field a ‘world-class military’ by 2049,” Secretary of Defense Lloyd Austin testified in June. The United States, he assured the Senate Armed Services Committee, continues to possess “the best joint fighting force on Earth.” But only by spending countless additional billions of dollars annually, he added, can this country hope to “outpace” China’s projected advances in the decades to come.

As it happens, however, there’s a significant flaw in such reasoning. In fact, consider this a guarantee: by 2049, the Chinese military (or what’s left of it) will be so busy coping with a burning, flooding, churning world of climate change — threatening the country’s very survival — that it will possess scant capacity, no less the will, to launch a war with the United States or any of its allies.