WASHINGTON—Conservationists are still fuming about President Obama's continued lack of follow-through on his promise to affix solar panels to the White House roof.

Environmentalist and climate advocate Bill McKibben at the International Day of Climate Action in 2009. (Credit: Matt McDermott) For now, however, they're willing to give him a pass on what they recognize would be mostly a symbolic gesture.

But a summons for civil disobedience at 1600 Pennsylvania Avenue this summer indicates they are unwilling to be anywhere near as lenient about a lightning rod of a proposed pipeline. It's known as the Keystone XL and it could pump millions more barrels of heavy crude from Alberta, Canada's oil sands mines to refineries along the U.S. Gulf Coast if the federal government greenlights it.

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