Edit the sentence to make it more concise: "This new thing that has happened is causing a lot of people to be concerned."
"This new development is causing concern for many people."
Complete the following task based on the instruction and optional input provided.### Instruction:
Edit the sentence to make it more concise: "This new thing that has happened is causing a lot of people to be concerned."

### Output:
"This new development is causing concern for many people."