The price of crude oil fluctuated on Monday around $104 a barrel amid tensions in Ukraine.
"We need to move away from business as usual," a U.N. official said.
The IPCC found greenhouse emissions have risen despite policies to reduce climate change.
A top building trades union is launching a midterm-election assault on 27 House Democrats.
The Treasury Department announced sanctions against six "Crimean separatists."
The leaders of the Senate Energy and Natural Resources Committee have asked the Energy Information Administration (EIA) to help them study issues related to lifting the ban on exporting crude oil.
The court said green groups were not able to show that carbon monoxide emissions would make global warming worse.
Clinton will keynote the summit put on by Sen. Harry Reid and Center for American Progress.
The Louisiana Democrat plans to hold a hearing on Keystone XL in May.