Space architecture of space and a space transportation infrastructure can be accelerated. Virgin Galactic has indicated plans for an orbital craft, SpaceShipThree. The demand for space tourism is one without bound. It is not difficult to imagine lunar parks or cruises by Venus. Another impetus to become a spacefaring species is planetary defense. The classic space mission is the Earth-colliding asteroid interception mission. Using nuclear detonations to split or deflect the asteroid is risky at best. Such a tactic could actually make the problem worse by increasing the amount of asteroid fragments that do end up hitting the Earth. Robert Zubrin writes:
Tourism in the Caribbean a proportion of GDP. In terms of employment, 11.3% of the region's jobs depend on tourism either directly or indirectly. It is often described as "the most tourism-dependent region in the world". Caribbean islands now depend on tourism for their economy, it being referred to as "the engine of their growth". Tourism is a huge contributor to the economies of all Caribbean countries and the biggest contributor to many of them such as Antigua and Barbuda, Bahamas and the Virgin Islands. It provides a steady revenue stream, with temporary blips due to hurricanes or recessions in the Western world and