5.2

1. Four ways to describe biodiversity 

 2. Within the Tree of life: number of species  

 3. Proportion of degraded land, and LPI  

4. Proportion of protected areas 

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Sources: 

1. _{https://openresearch.amsterdam/nl/page/72549/measuring-biodiversity}  
2. _{Ivica Letunic: Iletunic. Retraced by Mariana Ruiz Villarreal: LadyofHats, Public domain, via Wikimedia Commons, https://upload.wikimedia.org/wikipedia/commons/1/11/Tree_of_life_SVG.svg}
3. _{https://unstats.un.org/sdgs/report/2019/goal-15/
   https://ourworldindata.org/grapher/global-living-planet-index}
4. _{https://unstats.un.org/sdgs/report/2019/goal-15/}