washington white house promise wednesday would able uphold u.s. commitments international climate change agreement court rule heighten concern stability global carbon reduction pact reach last year share coal company reflect uncertainty day u.s. supreme court rule jump nearly percent early session thomson reuters u.s. coal index percent afternoon trade court deal serious blow obama administration climate change agenda tuesday take unusual step delay implementation clean power plan legal challenge regulation complete centerpiece obama administration climate change policy clean power plan design low carbon emissions u.s. power plant 2030 32 percent 2005 level decision temporarily block rule come unite state enter landmark agreement december countries around world reduce greenhouse gas emissions clean power plan expect main tool unite state fulfill part pact white house spokesman eric schultz tell reporters brief one part nation response climate change long-term extension tax credit renewable energy last year continue provide momentum transition power sector toward clean source energy schultz say inclusion tax credit go impact short term clean power plan say french government spokesman stephane le foll quote outgo foreign minister laurent fabius say cabinet meet decision good news even debate continue unite state claudia salerno venezuelan diplomat lead country delegation u.n. climate talk describe rule truly damage outcome pact twitter message late tuesday despite carbon rule white house say u.s. meet climate deal goals