There are more and more 'start ups' around the world experimenting with our common environment and this has to stop. Take the case of "Make Sunsets" . This US-based commercial company has conducted multiple unauthorized launches of weather balloons filled with sulfur dioxide (SO₂) into the stratosphere, primarily in the US, after being banned in Mexico. The goal is to sell "cooling credits" by claiming to offset warming by releasing particles into the atmosphere. Between the weakened US EPA and the lack of any global governance processes on this planet, these businesses will have their way with your future, if we let them. And theri motivation will be short term profits over long term benefits for humankind. Beware.