Gore’s terrific speech is here. Note: It plays for a minute and then stops. It takes 2 minutes for the video to buffer, then works fine. The last 10 minutes are here:
Gore, however, is not correct when he says “the early steps” for achieving 350 ppm are “very similar” to those for achieving 450 ppm (see “An open letter to James Hansen on the real truth about stabilizing at 350 ppm”). In fact, it is the later steps, say post-2030, that could be similar, but only if the actions in the first two decades are radically different.
McKibben’s report on the speech is here.