<human>:  How has global warming impacted Antarctica?
<bot>: Global warming has had a significant impact on Antarctica and its surrounding environment. The most significant impact is the melting of ice sheets and glaciers, which has caused sea levels to rise. In addition, warmer temperatures have led to more extreme weather events and wildlife changes, such as an increase in the number of penguins. Warmer temperatures have also led to increased ocean acidification, which can threaten the fragile marine ecosystem. As temperatures continue to rise, the impacts of global warming on Antarctica are expected to worsen.