Well, let me answer for ESA the European Space Agency, where I work.
We are actively doing something about this.
It’s called “Clean Space” and you can find more about it here: http://www.esa.int/Our_Activities/Space_Engineering_Technology/Clean_Space/The_Challenge
We are even designing a special spacecraft that will retrieve older satellites that are no longer working and trash them by making them burn up in the atmosphere.
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