  This work is based on the talk given by Csernai at the Blue Sky International
Conference in the Buda Castle on October 30, 2015, Budapest, Hungary. The human
development on the Earth is analysed based on basic physical principles and the
available resources. The areal and material resources are obviously finite, but
the very fundamental energy resources are sufficient for solid and sustainable
continuing development. These energy resources can compensate many of the
constraints arising from the finite material resources. The development is
going in the direction of increasing complexity on the surface of the Earth,
due to the increasing green mass and the developing biological and material
complex structures. This sustainable development is enabled by the
astrophysical conditions and constraints and these conditions provide a good
possibility for continuous further development in a sustainable way. This
development is characterized by the increasing neg-entropy on the surface of
the Earth.
