Reps. Ed Markey (D-Mass.) and Chris Van Hollen (D-Md.) came to the Earth Day Network event, but no senators.

Over on our main site, Ian Swanson reports that the Obama administration is claiming it wants to pursue both climate change and immigration legislation. White House economic adviser Larry Summers said Sunday that there is "no either/or" between the two issues, which are "both important."

Sen. Lindsey Graham (R-S.C.) threatened to abandon his work out of fury that Democratic leaders may take up immigration legislation first.

Sen. John Kerry (D-Mass.), who is crafting the bill with Graham and Sen. Joe Lieberman (I-Conn.), announced a temporary postponement.

The senator's declaration could halt or unravel the months-long effort to craft a compromise climate measure.

Sen. John Kerry (D-Mass.) is continuing to dispute suggestions that immigration reform legislation will delay his bill.

A Senate hearing next Tuesday on coal mining safety will also explore workplace hazards more broadly.

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The explosion of a large offshore oil rig in the Gulf of Mexico this week has quickly become political.

Buy-in from Big Oil and a powerful trade group would be an important political boost to the Senate climate effort.