(From the app)

The 2030 Target is the where our global pollution emissions need to be by the year 2030 per person to limit the worst impacts of global warming. We then need to virtually end this type of pollution by 2050.

How has this been calculated? The world's nations brought together leading scientists to assess 30,000 studies from a diverse range of work. This group, called the Intergovernmental Panel on Climate Change (IPCC) developed these recommendations to create a better world and avert disaster.