Readers are concerned that his campaign proposals would put Social Security’s finances on thinner ice, endangering their payments.

© Nicole Craine for The New York Times

There is widespread concern that President-elect Donald J. Trump may end it, since he has tried before. But that may be the wrong thing to fear.

© Andrew Spear for The New York Times

Negotiators agree that trillions are needed to help lower-income countries adapt and cope, but not on who should pay.

© Maxim Shemetov/Reuters

It shouldn’t be so easy to leave benefits on the table.