Our earth, the only planet we have, yet
.png/picture-200?_=19bcf9506c9 "The Earth")
The earth is the only planet we know, where life does exist. With the view from satellites (have a look with Google Earth) it seems to be a small and fragile planet in the vast dark and cold space. Our small world is much bigger than we think. With a radius of 6,378 km and a circum-ference of 40,075 km it has a surface of 510 million km2. Today, 71% of the surface is ocean water (361 million km2) 29% of the earth is covered with land (149 million km2).
The oceans have an average depth of 3.7 km (maximum is the Mariana trench with 10,9 km). The surface has an altitude between -430 m (Dead Sea) and 8,849 m (Mount Everest) above sea level. The distance to our sun is 150 million km and the average temperature of 14° Celsius (between -50°C and +70°C). Both, ocean and surface, are full of life, including us: the humans.
We have just a moment appeared as species on the earth (3.6 million years ago), and we occupied our planet in very short time and have achieved in 2020, that the human-made mass exceeds all liv-ing biomass (Elhacham et al. 2020). The global recourses for life are becoming scarce. Agricul-ture has a strong impact in utilization, degrading and polluting the global resources for life.