Stop the War

In 2071, the world is on the verge of an environmental catastrophe, leading to the extinction of human life on the planet. With the end clearly in sight, the scientific community decides to take a last desperate, alas covert action on its own. As time travel experiments show promise, an M. I. T. professor undertakes going back into the past to attempt remedial measures. According to the faculty, technology developed too fast during and immediately after the Second World War.
Averting the conflict seems the only available solution. Armed with the knowledge of history, the professor takes the leap.