The Senate is delaying work on a global warming bill for the second time this summer. The authors of a bill aimed at addressing climate change announced Monday they would not introduce their legislation until the end of the month, instead of the Sept. 8 date they scheduled before the August recess.

Sens. John Kerry, D-Mass. and Barbara Boxer, D-Calif., said their bill is “moving along well” but they needed “additional time to work on the final details” in part because of the death of Sen. Edward Kennedy, D-Mass., and Kerry’s recent hip surgery. The two said they also needed additional time to “reach out to colleagues and important stakeholders.”