As well as #Halloween, today is also #WorldCitiesDay & the focus is sustainab…

As well as , today is also & the focus is sustainability – a vital topic for the future of Earth and space exploration 🌍🌕 Take a look at some of the snaps of human impact on our planet captured by from Blog: http://blogs.esa.int/alexander-gerst/2018/10/31/world-cities-day/ …