There is still an urgent need for sustainable development worldwide. We should go for sustainable development in every aspect of human activities, e.g. agriculture, forestry, renewable energies, traffic & transport, fisheries, industry & business, tourism and also in cities and buildings.

For Earth-Day topics compare e.g.: https://www.earthday.org/earth-day-2021/ or e.g.: https://www.nasa.gov/earth-day-2021 ,(last visit: 2021-04-19).