Swedish climate activist Greta Thunberg has set her sights on changing how the world produces and consumes food in order to counteract a trio of threats: carbon emissions, disease outbreaks and animal suffering. In a video posted on Twitter on Saturday, Thunberg said the environmental impact of farming as well as disease outbreaks such as COVID-19, which is believed to have originated from animals, would be reduced by changing how food was produced. "Our relationship with nature is broken. But relationships can change," Thunberg said in the video marking the International Day of Biological Diversity.