New York Climate Week, Tuesday 23 September 2025: Despite the federal U.S. retreat, the global ambition to slash emissions and reach net zero remains intact, with commitments from cities, regions and companies rising steadily, according to Net Zero Stocktake 2025.

he approval of new antibody medications for Alzheimer's disease – lecanemab and donanemab – and diagnostic tests in the blood mark the beginning of a new era in Alzheimer's disease diagnosis and treatment. However, without rapid reform in healthcare systems, public policy, and societal attitudes, their potential will not be fully realised, argue 40 leading Alzheimer's disease experts in The Lancet Series on Alzheimer's disease.

Patient deaths increased in the emergency departments of hospitals acquired by private equity firms compared to similar hospitals, a nationwide study has found. Researchers linked the increase in mortality to cuts in salary and staffing levels. The findings amplify concerns about the growth of this for-profit ownership model in health care delivery.

Reducing polarization and "partisan animosity"—the distrust and hatred of the other party—is remarkably difficult, according to a new study published in the Proceedings of the National Academy of Sciences evaluating past attempts.