So what we need is atmosphere control. Controlling means sensing and actuating. We need to know the actual state of the atmosphere, compare it with an established standard and to have the means to modify it accordingly. This sounds easy, but is awfully difficult. Atmosphere is a global system. How can we measure atmospheric constituents entirely? What are acceptable limits for garbage constituents? And once we know the unwanted constituents and their wanted levels, how can nations ensure that every one sticks to reducing the un-wanted garbage? Let’s start with the first step: How can we measure garbage concentrations globally? Take a probe here, take a probe there? Even if we would do that at thousands of sampling stations worldwide, would this give us the overall concentrations? No, because we would also have to climb mountains and even would have to go much higher at any place to sample the entire atmosphere. What we rather need is a globally integrating sensor. We do have sensors like this. They are called environmental satellites. The most sophisticated of these is the European Environmental Satellite, ENVISAT. ENVISAT constantly monitors our atmosphere and Earth’s surface properties from space since March 2002. It is the biggest one as well, com-parable with a truck: 10 meters long, 3 meters wide, and weighting 8 tons. With 2.3 Billion Euros it was also by far the most expensive.