Update README.md

README.md

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 *Waste generation*
 - Landfill volumes have fallen due to the lockdown, whereas medical waste from hospitals have been significantly increased due to the disposal of tons of soiled PPE.
 - Figure 1: Reduction in landfill volumes during the pandemic (survey from mid-March to May - [Lodge, 2020](https://karmaimpact.com/landfill-usage-down-during-covid-19-pandemic/))
+- ![picture?](https://gitlab.cba.mit.edu/classes/863.19/CBA/cbasite/raw/master/people/patricia/zund/Zund.jpg)
 - Figure 2: The expected trend of medical and MSW waste flow durong the pandemic ([Klemes et al., 2020](https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7183989/pdf/main.pdf))
 - China has the most data on this issue: 
     - Amount of MSW in large and medium cities was reduced by 30% during the disease outbreak.