Biden reappoints a top climate scientist who was removed by Trump.

The Biden administration has reappointed the scientist responsible for the National Climate Assessment, the federal government’s premier contribution to climate knowledge, after he was removed from his post last year by President Donald J. Trump.

The removal of the scientist, Michael Kuperberg, was part of an effort in the final months of the Trump administration to thwart the climate assessment, which compiles the work of hundreds of scientists and helps shape regulations.

Dr. Kuperberg was replaced last November by David Legates, an academic who had previously worked closely with climate...