John Waldman

Many hydroelectric dams produce modest amounts of power yet do enormous damage to rivers and fish populations. Why not take down these aging structures, build solar farms in the drained reservoirs, and restore the natural ecology of the rivers?

As agriculture and energy production have made strides toward becoming more sustainable, the world’s fisheries have lagged behind. But restoring our beleaguered oceans to health will require an emphasis on diversification and conservation — and a more sensible mix of fishing practices.

If you are a resident of the East Coast of the United States or of Western Europe, when did you last attend a shad bake, eat an eel, or watch Atlantic salmon vault a waterfall? Community shad bakes once celebrated the return of American shad to rivers as a marker of spring. Recently though, a dearth of shad led to a “shadless shad bake” on the Hudson — a river that in its glory days supplied more than four million pounds of shad in one season.