If everyone in the world lived like a Dane, the global population would need the resources from about 4.5 Earth-like planets. The report also found that world populations of fish, birds, mammals, amphibians and reptiles fell overall by 52 percent between 1970 and 2010. Danish based Maersk company pollute the nature more than the whole Denmark together.

As long as "hole" in sail is < 1/2 the light wavelength, the sail appears solid to incoming photon) "Perforated" Solar Sail - Similar to microwave "hole" concept, but for Solar / Laser Sail (Holes ~0.2 µm) Magnetic Sail (MagSail) (Momentum from solar wind "pushes" against magnetic field produced by MagSail, which is actually a ring of superconducting cable) Particle Beam (Macroscopic pellets or microscopic particles "push" vehicle) Various analogs to...