By Jeffrey D. Sachs, Guido Schmidt-Traub and Vanessa Fajans-TurnerNEW YORK — The single most important public health measure of 2019 is the replenishment of the Global Fund to Fight AIDS, Tuberculosis and Malaria.

By Mario Pezzini and Gabriela RamosPARIS — At the current rate of progress, it will take more than 200 years to achieve gender equality and female empowerment at work.

By Anu Madgavkar and Olivia WhiteMUMBAI/SAN FRANCISCO — Worldwide, more than 4 billion people are connected to the Internet, spending an average of roughly six hours per day on Internet-enabled devices and services.

By Homi Kharas and Eswar PrasadITHACA/WASHINGTON, DC — Jim Yong Kim’s sudden resignation as president of the World Bank Group (WBG) offers an opportunity to reflect on the direction, legitimacy and effectiveness of that 75-year old institution.

By Matthew Caruana Galizia, Andrew Caruana Galizia and Paul Caruana GaliziaLONDON — The worldwide network that facilitates transnational organised crime and corruption is, tragically, one of globalisation’s most enduring success stories.

By Andrea Boggio and Colin OhrtSMITHFIELD, RHODE ISLAND/HANOI — When it comes to fighting infectious diseases, progress cannot be gauged by the availability of resources; the most important metric is the number of lives saved.

By Michael Chui and Martin HarryssonSAN FRANCISCO — The excitement surrounding artificial intelligence (AI) nowadays reflects not only how AI applications could transform businesses and economies, but also the hope that they can address challenges like cancer and climate change.

By Ian Goldin and Robert MuggahOXFORD — Let us hope that 2019 is the year when the historical tide turns. In 2018, divisions within and between countries continued to deepen.

Marc Fleurbaey and Helga NowotnyPRINCETON/VIENNA — Climate scientists are sounding the alarm about global warming, but the world is not responding.