Consider all the actions possible tomorrow, which individuals or groups could take. Are there any which would "obviously" (meaning: you believe it with high probability, and you expect that belief to be uncontroversial) result in decreased x-risk?
(For example, consider reducing the size of Russia and the US's nuclear stockpiles. I'm curious if this is on the list.)
(I include "which individuals or groups" could take because I am interested in what actions we could take if we all coordinated perfectly. For example, neither Russia nor the US can unilaterally reduce both their stockpiles, and perhaps it would increase x-risk for one of them to lower only theirs, but the group consisting of US and Russia's government could theoretically agree to lower both stockpiles.)
If "uncontroversially" means something like "we can easily see that their net effect is to reduce extinction risk," then I disagree. To give just two examples, the known availability of alternative foods might decrease the perceived cost of nuclear war, thus making it more likely; and it might instill a sense of false confidence in decision-makers, effectively diverting attention and funding from more effective risk-reduction measures. I'm perhaps willing to believe that, after weighing up all these considerations, we can all agree that the net effect is to reduce risk, but I think this is far from obvious.