GLOBAL HEALTH THREATS

Why China's top Covid expert is preparing for next global pandemic

. A study published in the Journal of Geophysical Research: Atmospheres in 2020 found that ocean surface warming in subtropical regions is expanding the width of the tropics. “The reservoir of bacteria and viruses is expanding as the Earth warms,” Zhang added, noting that this will expose more animals to bacterial, viral, and fungal infections as vectors like ticks and mosquitoes find more habitable land.