”If you eat less meat, then you can board another plane. It is that simple. In order to become sustainable we need to measure our ecological footprint in numbers and an overall budget.  And the size of the budget depends on how many people we are in the world. But better and smarter technology can help us keep within the budget.” The words come from Michael Zwicky Hauschild, professor at DTU Management Engineering. He is one of the most acknowledged experts in the field of Quantitative Sustainability Assessment. That means, he develops tools to calculate the ecological footprint of a...