ESA have a programme on Space Debris, you can read about it here. Their programme includes Analysis and prediction, Scanning & observing, Re-entry and collision avoidance, Mitigating space debris generation, Debris removal, Hypervelocity impacts and protecting spacecraft and International cooperation. And international cooperation certainly includes with NASA. So although it is reasonable to ask "are we doing enough", the professionals at the space agencies who are best placed to answer this are certainly doing a lot of things.