![Topics on the Global Earth Challenge citizen science app](http://static.sciencelearn.org.nz/images/images/000/004/884/full/OSC_ART_35_Earth_Day_Global_Earth_Challenge_4_Topics_v1.png?1674176203)
Currently, the Global Earth Challenge citizen science app has four research topics: plastic pollution, air quality, insect population and food supply.
Currently, the Global Earth Challenge citizen science app has four research topics: plastic pollution, air quality, insect population and food supply.