56 problems carry act now or lose it

These problems come with a countdown. Some windows are about irreversibility: once a species is gone or a coastline locks in the wrong infrastructure, no later effort recovers what was lost. Others are deadline windows: a standards cycle, a launch opportunity, a market moment — miss it and the work gets slower and costlier but not impossible. Both kinds change what a good response looks like: speed becomes part of the solution's design, not an afterthought.