Many experts now believe that even if all space littering were to stop completely, the number of stray objects would continue to increase for centuries. The reason : debris is now so dense that objects will continue to crash into each other, creating even more objects, expanding the rubbish cloud geometrically. "We’ve been saying for years that these things are going to happen," says Nicholas Johnson, head of NASA’s Orbital Debris Program Office. "Until they happen, it’s hard to get people’s interest. " What seems to best describe Nicholas Johnson’s attitude towards what has happened
A. He is happy that people are starting to pay attention to the problem. B. He is critical that people have not paid enough attention to the problem. C. He is objective when commenting on the problem of cosmic junk. D. He is supportive to what people have done to deal with the problem.