Sustainability of Gab Fabs The Rio+20 Environment Conference is set to begin in its namesake Brazilian city tomorrow. The event is concurrently described as the biggest conference in United Nations history and one in which the expectations are very low. There have been several analyses documenting the unrealized predictions of doom and gloom that emanated from the 1992 Rio Declaration on Environment and Development. In the rich countries, most of the environmental concerns voiced 20 years ago are statistically better today, despite the lack of any multinational effort. Meanwhile, Rio+20 is expected to draw 50,000 people from 190 countries. That is potentially 35,000 MT in carbon just for air travel (based on UCL Environment Institute par...